Which best explains why a pyramid is used to represent energy flow within an ecosystem? Hint: what happens to available energy as you go up?

1. Because available energy decreases as you go up

2. Because the organisms get bigger

3. Because the amount of the organism is more

4. Because further of organisms use less energy

When lactate builds up in a runners muscles it causes a burning sensation what causes this to occur

Which of the following types of stars is most likely to end up as a supernova? in graph a, the curve peaks at 800 nm, in the red section of the visible light spectrum. in graph b, the curve peaks at 550 nm, in the green section of the visible light spectrum. in graph c, the curve peaks at 450 nm, in the blue section of the visible light spectrum. in graph d, the curve peaks at 300 nm, in the violet section of the visible light spectrum. a b c d

Which of the following explains why a tree is often used as a model to represent the principle of common descent