10)
What is point source pollution of an aquatic ecosystem?
A)
pollution of freshwater sources
B)
pollution from many sources that combine into one
pollution that occurs over a wide area; water that runs off from fields,
parking lots, and other land surfaces
D)
pollution that can easily be identified with a single discharge source, such
as an open pipe which drains into a body of water

Answer:

D

Explanation:

the point if of water pollution can be easily identified

What elements makes up a glucose molecule?

Beneficial bacteria are found in our digestive tract
A. true
B. False

please help

I will give brainliest and 5 * and 10 points for the best answer

I don't want to see an link if I do you will be reported

How do plants obtain their energy?

Which type of reproduction results in variation of offspring?

4.
What is the salinity of seawater?
1.5 percent
3.5 percent
10 percent
5.5 percent

name two tissues which are thickened with lignin​

A wave has a frequency of 64 Hz and a wavelength of 17 meters. The speed of the wave is

Describe why food needs to be digested from large to small molecules.

Drag each label to the correct location on the chart.
Sort the actions and terms based on the type of pollution they directly cause.

Regulation of heart rate is most closely associated
with the
A) cerebrum
B) cerebellum
C) somatic nervous system
D) autonomic nervous system

Of the three major types of handwriting characteristics line form includes, smoothness of the lines,
pen pressure, and slant
True or False?

ever since i learned that your brain can see your nose but ignores it i cant stop seeing my nose and its getting annoying pls help

people who take antibiotics are always told to complete the treatment rather than stop taking the medication when they feel better suggest two reasons why people are given this advice​

I need help please :(

The real length of one villus is 0.8 mm
Calculate the image length if the villus is viewed at a magnification of x20

magnification = size of image / size of real object

1. Which equation best represents the dissociation of water molecules into hydrogen ions and hydroxide ions?

A garden contains 40 flowers, 30 of which are red. What is the frequency of red flowers?

ANSWER QUICK PLZ

The photo shows several Volvox, one of the simplest multicellular living things. Volvox have no tissues.

What other three things do Volvox also likely lack?

Linnaeus used the _____ language in his two-word naming system.

(No links)
Which is NOT a characteristic of unsaturated fats?
A. liquid at room temperature
B. animal fats
C. kinks in the carbon chain
D. not fully saturated with hydrogens​

what gas will make a flame bigger?

Whoever gets it right i will mark brainest

both plant and animal cells:
A) produce proteins
B) contain a large vacuole
C) photosynthesize
D) contain green pigments​

Organelles are found in...
A. the blood stream of complex organisms.
B. inside most cells.
C. constantly moving between cells.

Select the correct statement about the three-chambered hearts of amphibians and nonbird reptiles. A scheme of blood circulation of reptiles except for birds. The reptiles have a three-chambered heart that consists of two atria and one ventricle with an incomplete septum. There are two circuits: pulmonary and systemic. In the pulmonary circuit, the blood from the right ventricle is pumped in to lung capillaries and returned to the left atria. In the systemic circuit, the blood is pumped from the left ventricle to the systemic capillaries via the left systemic aorta and is then returned to the right atria. There is also one vessel going from the right ventricle to the aorta right before it branches to smaller arteries. This vessel carries mixed blood. All blood on the right side of the circuits is venous and all blood on the left side is arterial. Select the correct statement about the three-chambered hearts of amphibians and nonbird reptiles. The three-chambered hearts of amphibians and nonbird reptiles are facultative, allowing variation in blood flow through the heart. The three-chambered heart is inferior to the four-chambered hearts of birds and mammals, limiting the evolutionary success of amphibians and nonbird reptiles. Pulmonary and systemic blood fully mixes in the ventricle of a three-chambered heart.

How do species evolve?

What do you think of when you hear the word "energy?"
I
(Pls somebody answer)

You find a fossil in your backyard. 12% of the Carbon 14 isotope is remaining. How old is the fossil?

plzzzz help
Commensalism is a symbiotic relationship in which one organism benefits and the other organism neither benefits nor is harmed.
Mutualism is a symbiotic relationship in which both organisms benefit.
Parasitism is a symbiotic relationship in which one organism benefits and the other organism is harmed.
Predation is a relationship in which one organism preys on (and eats) another organism.
Competition is relationship in which two organisms must fight (directly or indirectly) for resource

Objective:
Given a description of the relationship between two organisms, determine if their relationship is competition, commensalism, predation, mutualism, or parasitism.

1. Polar Bear and Seal: A polar bear hunts and captures the seal for its food. _______________________________

2. Lice and Humans: Lice attach to human hair and enjoy the warmth given off by the human. They eat tiny amounts of human blood, causing the human to have little red bumps that are quite itchy. They may also transmit disease to the human. _______________________________

3. Male lions: Adult male lions will fight each other for control over a pride and mating rights. _______________________________

4. Goby Fish and Sea Urchins: The goby fish live amongst the sea urchins and are provided protection from their predators. _______________________________

5. Wolf and Caribou: The wolf hunts and kills the caribou for its food. _______________________________

6. Bats and White-Nose Fungus: The fungus grows over the bat’s face during hibernation which can kill the bat or cause it to wake up from hibernation early and starve. ____________________________________

7. Hermit Crabs and Snails: Hermit crabs live in abandoned shells made by snails. _______________________________

8. Boxer Crab and Anemone: The boxer crab carries a pair of small anemones in its claws. When a predator approaches, it waves the anemones around which present its stinging tentacles and deters the predator. The anemones get small particles of food from the crab when it eats. _______________________________

9. Bear and Salmon: The bear catches salmon in the river and eats it for food. _______________________________

10. Grass and Oak Trees: Oak trees grow tall and put their branches out wide to collect sunlight. This shades the grass growing underneath from getting sunlight. _______________________________

11. Mycorrhizal Fungi and Plants: The mycorrhizal fungus grows into the roots of some plants and gets nutrients from the plant. The fungus helps the plant absorb inorganic nitrogen and phosphorus from the soil. Some fungi also secrete antibiotics, which can help protect the plant from parasitic fungi and bacteria. _______________________________

12. Bison and Cowbird: As bison walk through the grass, it kicks up insects like grasshoppers. These are seen and eaten by the cowbird. _______________________________

13. Mistletoe and Oak Tree: Mistletoe extracts water and nutrients from the oak tree, causing harm to the oak tree. _______________________________


14. Frog and Insect: The frog uses its long, sticky tongue to catch insects for food. _______________________________

15. Tapeworm and Dog: The tapeworm enters the dog when the dog eats feces containing tapeworm larvae. The tapeworm attaches to the dog’s stomach and feeds off of the dog’s nutrients. This often causes harm to the dog. _______________________________

Experiments have shown that adult human hearing is most sensitive in the frequency range of the sound of a human baby crying. Based on the threshold of audibility curve shown for an adult male shown below, into which frequency range does most babies' crying fall? Threshold of audibility equal-loudness curve A. 25 – 50 Hz B. 250 – 500 Hz C. 2500 – 5000 Hz D. 10,000 – 20,000 Hz