Choose all the answers that apply. Oxygen is .

1 released into the air by the lungs
2 pumped to cells by ventricles
3 picked up in the alveoli
4 transported by blood

Many animals cannot sweat to maintain a stable body temperature. what is one other way animals can cool down?

An easy way to calculate the amount of energy available at each level is to what?

What would be the result if crossing over did not happen during meiosis in humans? a. there would be less genetic variation in humans. b. parents would be more likely to look like their children. c. the human population could not reproduce. d. children would have more chromosomes.