i need help on the second one

What component of earth’s atmosphere exits entirely as a result of photosynthesis

4. What are the first organisms (colonizers) on the land? *
O
Flowers
Ants
Lichens & mosses
O
Oaktree
Submit

Which resource is a renewable resource?
A. Coal
B. Gemstones
C. Metal
D. Trees

What is the main function of the cell membrane of a cell?
A. to exchange nutrients and the cells waste with the external environment
B. to limit the size that cell can reach
C. To organize the cell's internal contents
D. to protect the cell from harmful substances in the environment

Which of these are long strands of DNA?
A. Chromosomes
B. Fossils
C. Genes
D. Mutations

Help.. 14 _____ are substances that can cause cancer.
15
Scientists join cancer cells with antibody-producing white blood
cells to produce _____.

Population Genetics

Describe:

How is a population described in population genetics?

What biotic Ann abiotic factors determine an animal's place in the world

Why do healthy people get stronger with exercise but people with DMD don’t?

The high temperature on Friday was 8 degrees above zero. The low temperature was 3 degrees below zero. Which expression gives the average of the low and high temperatures?

a
Left-bracket negative 3 + (negative 8) right-bracket divided by (2) Right-bracket

b
(negative 3 + 8) divided by 2

c
(negative 3 + 8) divided by (negative 2)

d
Negative (3 + 8) divided by 2

What is required for both the light-dependent and light-independent reactions to proceed?
energy
CO2
water
ATP and NADPH

Click to fix any plural or possessive errors below. If there is no error, just click
"Submit Answer." ©
When Aaron Burr needed to cross a stream, he used
several board's to build a makeshift bridge.

WHY is this football player wearing an oxygen mask? what is the importance of oxygen here? What is he trying to avoid by wearing the oxygen mask?

What do you think the word biodiversity means? Why is biodiversity important for the stability of ecosystems?

During physical activity metabolism speeds up and muscles require more oxygen and nutrients. How does the heart keep up with this demand? Choose all that apply.

The heart goes in tachycardia mode to deliver more oxygen to the muscles.
The heart beat has a steadily constant beat of 60 beats per minute.
The heart pumps faster (increased heart rate) and stronger (increased stroke volume).
An increased cardiac output helps deliver more nutrients and oxygen to the working muscles.
The lungs are the organs bringing oxygen to the muscles, the heart is not involved.

Astronauts have been exploring outer space in manned spacecraft since 1961. Which of the following would have made it very dangerous for people to explore outer space?
A.
if the Earth's orbit passed through dense meteoroid fields
B.
if there were fewer cosmic rays passing through the solar system
C.
if the asteroid belt was farther from the Sun
D.
if the Earth's orbit was more circular than Venus' orbit

What type of relationship where both organisms benefit

Why does the amount of energy DECREASE as you move up the pyramid?


It is absorbed by the sun


It is lost as heat


The animal vomits part of it's food

What would happen if all of the foxes (secondary consumers) were hunted until they were gone in a forest ecosystem? *

I need help with this Biology

Which explanation below is the most accurate regarding animal and plant adaptations for survival in a desert biome

Why did the population of deer increase during the wolves absence?
a Humans planted more plants in the area

b Their predators were gone

c The deer switched from asexual to sexual reproduction

d Rivers brought more fish to the area

what systems do you use when you have a scrape knee

The pH of a solution determines the charge of certain R groups. The pH of pineapple fruit ranges from 3.5 to 5.2. Predict the effect on the activity of bromelain if it is used in a product with a pH of 11.

A company has several factories around the world and has decided to transition from burning fossil fuels to using alternative energy resources. How could a decrease in burning fossil fuels impact the atmosphere?
A It could decrease the oxygen levels of the atmosphere
B it could increase the nitrogen levels
C it could decrease the carbon dioxide levels
D it could increase the sulfur dioxide levels

In guinea pigs, the allele for black fur(B) is dominant over the allele for
brown fur(b), and the allele for short fur (F) is dominant over the allele
for long fur(t). What percent of the offspring of a BbFf x bbFF Cross
will have short black fur?
Select one:
0%
100%
25%
50%

Can you help me on these?

Why are hydrothermal vents capable of nurturing deep-sea life?
A. They warm the water, creating a favorable temperature range for deep-sea life.
B. They provide migratory routes for underground bacteria to emerge on the sea floor.
C. They provide nutrients from Earth’s surface, which the deep-sea creatures can feed on.
D. They provide the right conditions for the formation of chemicals, which bacteria can use as a source of energy.
E. They provide migratory routes for vent creatures to emerge onto the sea floor, which deep-sea life can feed on.

PPLZZZZ HELPP!!!



Thank you if you can

Which of following are natural factors that can cause extinctions?


I. climate change

II. asteroid impacts

III. volcanic eruptions

IV. changes in oxygen levels in seawater

A.

I, II, III, and IV

B.

I, II, and III only

C.

II and III only

D.

I and IV only
i need help asap