The half life of uranium-235 is 4.5 billion years. If 0.5 half-lives have elapsed, how many years have gone by?
A. 4.5 billion
B. 9 billion
C. 2.25 billion
D. 4 billion ​

Answers

Answer 1
Answer:
C. 2.25 billion years

Explanation:
If one half life has elapsed, 4.5 billion years will have gone by. Half of a half life has elapsed, so half of 4.5 billion years will have gone by. 4.5 billion years divided by 2 is 2.25 billion years.
Answer 2

Answer:

2.25 billion

Explanation:

option C is correct


Related Questions

Using the following nucleotide sequence, predict the complementary strand sequence:
5'-TTAAACCCGTTGGAAC-3'



5'-AATTTGGGCAACCTTG-3'

3'-AATTTGGGCAACCTTG-5'

03-CCGGGTTTACCAAGGT-5'

0 3'-TTAAACCCGTTGGAAC-5'

Answers

The predicted the complementary strand sequence for 5'-TTAAACCCGTTGGAAC-3' is 3'-AATTTGGGCAACCTTG-5'.

What is DNA?

Deoxyribonucleic acid or DNA is a double helix molecule composed of two complementary strands.

According to the base pair rules, Adenine pairs with Thymine and Guanine pairs with Cytosine.

In conclusion, the predicted the complementary strand sequence for 5'-TTAAACCCGTTGGAAC-3' is 3'-AATTTGGGCAACCTTG-5'.

Learn more about base complementarity here:

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Answer:

Your answer would be AATTTGGGCAACCTTG-5′

Explanation:

Differentiate between communicable and non-communicable diseases. Give one example of each​

Answers

Answer:

hope this helps helps you a lot

my handwriting is bad sorry for that bhai

pls answer this question i think easy

Answers

Answer:c

Explanation:it must be c if im wrong then sue me!

Answer:

B. Food is broken into simpler molecules.

Explanation:

these small molecules are; proteins, amino acids, glucose, e.t.c

Is a ping pong ball a nonliving or living thing and why

Answers

Answer:

A ping pong ball is nonliving because it does not have a brain or living cells. It is plastic.

2. Slime moulds cannot be put neither in kingdom Plantae nor in kingdom Animalia. Give reason.

3. Give the disadvantages of the two kingdom classification.

Answers

Answer:

3. In the two-kingdom classification following are drawbacks:-

The plants comprised of photosynthetic and non-photosynthetic species. Fungi, that feed on dead organic matter, were placed under photosynthetic plants. There was another class of classification needed were the organisms with the same characteristics were clubbed into one kingdom. This system did not distinguish between the eukaryotes and prokaryotes, unicellular and multicellular organisms and photosynthetic (green algae) and non-photosynthetic (fungi) organisms. There are some organisms which neither fall into plant nor animal kingdom like Lichens.

Explanation:-

Hope my answer is helpful.. If yes, plz mark me as brainliest

What effects are produced on environment by industry?​

Answers

Answer:

climate change, loss of natural resources, air and water pollution and extinction of species.industrial processes can have negative environmental impact.

Explanation:

please help me out, name all 3 parts of the atom. ​

Answers

1. Proton
2. Neutron
3. Electron

In the atom, the arrow 1 depicts the proton. The arrow 2 depicts the neutrons, and the arrow 3 depicts the electrons. All three of these are subatomic particles.

What is an atom?

An atom is the fundamental structural unit of matter. It consists of protons, neutrons, and electrons. Electrons are negatively charged particles that are present outermost shell of the atom, while protons are positively charged particles that make up the core of the atom. The neutron doesn't have any charge.

Both neutrons and protons make up the core of an atom, while electrons revolve around them. A neutral atom has equal numbers of protons and electrons. Example: the sodium atom.

Hence, the atom showing arrow 1 is a proton, arrow 2 is a neutron, and arrow 3 is an electron.

To learn more about atom, refer the following link,

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What are true of multicellular organisms

Answers

Answer:

hope this answer help you

Which of the following would be examples of abiotic factors in a mountain river ecosystem?
fish, algae, and sand

sand, water, and fish

sand, water, and minerals

water, fish, and algae

Answers

Sand , water , and minerals

See the image below!

Answers

Answer:

it is cytosine part of deoxyribonucleic acid

Economic impact of agricultural pollutants on water sustainability for agricultural production. summarise your findings in a table form​

Answers

Answer:

nalaqdua

Explanation:

sbospka ai9wlhzux5 s8fvekg

Mary likes sour foods, and she decided to eat a slice of lemon. As she bit down on the lemon, she felt an uncomfortable squeezing-type sensation in her cheek as one of her salivary glands emptied its secretions into her mouth. Which of the three pairs of salivary glands did she feel

Answers

She felt the parotid.

I'm 99% sure this is right lol

Động vật nào sau đây máu đu nuôi cơ thể không pha trộn giữa máu giàu o2 và máu giàu co2

Answers

Answer:  Tôi không thể giúp anh vì anh chưa bao giờ đặt tên cho bất kỳ con vật nào

asexual reproduction can be a disadvantage to a population if

Answers

Answer:

it can be a disadvantage to population because it produces many offsprings which can lead to high increase in population.

The disadvantage of asexual reproduction is that it limits the evolutionary process

Carbohydrates info
A. AKA:
B. Composed of:
C. Monomer:
D. Polymer:
E. Functions:

Answers

A: Carbs
B:Carbon, hydrogen and oxygen
C:Monosaccharides
D:Polysaccharides
E: Provides energy to the human body.

All the following rely on ATP as a source of energy except
Select one:
a. the active transport of glucose from the small intestine to the blood
b. diffusion and osmosis across semi-permeable membranes
c. the movement of the flagella of sperm for motility
d. exocytosis of waste substances across a semi-permeable membrane

Answers

Answer:

b. diffusion and osmosis across semi-permeable membranes

Explanation:

ATP (adenosine triphosphate) is a high energy carrying molecule in the system of living organisms. It posseses the ability to store and release energy for use by organisms during biochemical activities. However, some processes do not require ATP to occur and are called PASSIVE TRANSPORT while those that require energy (ATP) are called ACTIVE TRANSPORT.

In the above options, the processes listed as follows require ATP to occur:

- The active transport of glucose from the small intestine to the blood

- The movement of the flagella of sperm for motility

- Exocytosis of waste substances across a semi-permeable membrane

However, the diffusion and osmosis across semi-permeable membranes, which is a passive transport does not require ATP.

ANSWER AND I’LL GIVE BRAINLIEST

Which of the following statements can you infer would happen If one organ system stopped working?
a. The other organ systems would have to work harder to make up for the broken system
b. The other organ systems would stop working too.
c. The other organ systems would still work on their own but might have to work harder to complete their function correctly.

Answers

Answer:

b

Explanation:

After one system shuts down, the others would slowly start to shut down as well until the body can no longer maintain homeostasis and the person would slowly die. 3. All systems would be working together but the main ones would be muscular, nervous, and skeletal.

Cells in the human body carry out different functions. Which cells help the body fight off diseases and remain healthy? Choose the two that apply.

Answers

Phagocytes and lymphocytes

Which ocean borders the western coast of South America

Answers

Answer:

Pacific Ocean

Explanation:

here is your answer

The Pacific Ocean borders the western coast of south america

What is the correct structure of ATP? A. Ribose sugar, Adenine base, 3 Phosphate groups B. Triglyceride head, Ribose sugar, 3 fatty acids C. Ribose sugar, Phosphate group, Nitrogen Base D. Deoxy Ribsose sugar, Adenine base, 3 Phosphate groups

Answers

Answer:

The correct structure of ATP is

A. Ribose sugar, Adenine base, 3 Phosphate groups

Explanation:

The structure of ATP is a nucleotide, consisting of a nitrogenous base (adenine), a ribose sugar, and 3 serially bonded phosphate groups.

Besides plants, what other factor distinguishes one biome from another biome?
(A) the number of plant species in the biome
(B) the variety of animal species
(C) average temperatures and precipitation
(D) geographic location

Answers

C) Average temperatures and precipitation


•Differentiate between virus and viroids.​

Answers

Viruses (Virus particles or virions) are usually units consisting of nucleic acids and coat proteins called capsids.

Viroids consist only of RNA, i.e. they contain no protein at all. Except for a few cases, viruses are not surrounded by a membrane.

Answer:

Viruses (Virus particles or virions) are usually units consisting of nucleic acids and coat proteins called capsids. Viroids consist only of RNA, i.e. they contain no protein at all. Except for a few cases, viruses are not surrounded by a membrane.

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.

.

....

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..nok nok tera bhai aaya

The Punnett square illustrates a cross for color of the flower.
Based on the phenotypes and genotypes of these offspring. It is clear that purple flower color allele is
and the parents are
dominant
polygenetic
recessive
ntum. All rights reserved.
hp

Answers

Answer:

All right reserved

Human skin color is a good example of polygenic (multiple gene) inheritance. Assume that three "dominant" capital letter genes (A, B and C) control dark pigmentation because more melanin is produced. The "recessive"alleles of these three genes (a, b & c) control light pigmentation because lower amounts of melanin are produced.

hope it will help

Here, from the cross of the purple and white flower, all offspring are purple, which indicates that the purple color is dominant in nature and is present in Option A.

What is Punnett Square?

The Punnett square is a tool used to predict the probability of offspring inheriting specific alleles from their parents. If all of the offspring exhibit the same phenotype (such as purple flower color), it is likely that the parents both carried at least one dominant allele for that trait. This would mean that the purple flower color allele is dominant. Here, the parents are both purple and white, so all the offspring are dominant in nature.

Hence, from the cross of the purple and white flower, all offspring are purple, which indicates that the purple color is dominant in nature and is present in Option A.

Learn more about the Punnet Square here.

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complete question is below

The Punnett square illustrates a cross for color of the flower (purple- parent, white -parent). Based on the phenotypes and genotypes of these offspring (all purple), it is clear that purple flower color allele is

A.) Dominate

B.)polygenetic

C.) recessive

An individual with two different versions of a gene is genetically ____________ . In traits with a simple pattern of inheritance, only the trait conferred by the ____________ form of the gene will be visible. The other form of the gene is ____________ : it confers a trait that is only visible when the individual is genetically ____________ , or has two identical copies of the gene.

Answers

Answer:

heterozygous; dominant; recessive; h.o.mo-zygous

Explanation:

Genetics can be defined as the scientific study of hereditary in living organisms such as humans, animals and plants.

In Genetics, co-dominance can be defined as a phenomenon in which two (2) alleles of the same gene are present in a living organism and both are equally expressed to a degree or simultaneously.

This ultimately implies that, co-dominance is a phenomenon that typically involves the relationship between alleles i.e the two (2) versions of a gene present in living organisms. Also, a single version of a gene expressed by a living organism is referred to as an allele.

Trait can be defined as a distinguishing quality or characteristic of a living thing.

Simply stated, a trait refers to the specific features or characteristics possessed by a living organism. It is essentially transferred from the parent of a living organism to her offspring and as such distinguishes him or her.

Some examples of traits in genetics are colorblindness, handedness, curly hair, height, complexion, weight, hair color, dimples, tongue-roll, etc.

In Genetics, when an individual has two (2) different versions of a gene, he or she is said to be genetically heterozygous.

In traits with a simple pattern of inheritance, only the trait conferred by the dominant form of the gene from the parent organism will be visible in the offspring of a living organism. The other form of the gene is recessive : it confers a trait that is only visible when the individual is genetically , or has two identical copies of the gene.

match each term to its definition
a steam of plasma

Answers

Answer:

The solar wind is a plasma, a stream of charged particles (ions and electrons) that are continuously escaping from the Sun into the interplanetary medium.

Whch part of reproductive system produces semen​

Answers

The answer is Testicles (testes)

What is the Constant of “which bait works best for a fly trap?”

Answers

Answer:

Mix scraps of meat (the older, the better) with something sweet. Lots of people swear by using rotten fish or shrimp, which probably work best because they smell so much. Bait for Fruit Flies: Use fruit (the riper, the better), apple cider vinegar, fruit juice, syrup, wine, beer, or any combination

Dose anyone know the answer

Answers

Answer:

Anthracite is the answer

Answer two questions in detail and get brainliest!

1.Explain what makes a scientific experiment reliable. Be sure to include at least three reasons to support your answer.

2.During research, why is it important to use peer reviewed evidence when collecting background information during a scientific investigation?

Answers

Answer:

1:When a scientist repeats an experiment with a different group of people or a different batch of the same chemicals and get very similar results then those results are said to be reliable.Reliability is measured by a percentage if you get exactly the same results every

time then they are 100% reliable.

2.The peer reviewer determines whether the introduction provides sufficient background information on the research topic, and ensures that the research question and hypothesis are clearly identifiable.

Explanation:I really hope this helped you in any way (pls tell me if I did anything wrong)

What is atom in a chemical reaction?​

Answers

Answer:

the atoms are molecules that react with each other, they're called reactants

Explanation:

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