Why does the h+ gradient across the membrane dissipate when the light goes off? what happens to the rate of atp production?

What is the next step in muscle contraction after the actin changes shape? (apex)

How do the sperm cells get from the stigma to the ovules?

Which of the following is an example of competition a. the leaves of a tree prevent a small shrub from getting sunlight. three species of birds feed a different heights in the same tree. b. three species of birds feed at different heights in the same tree c. zebra and giraffe’s feed on different grassland plants d. cats living in two different homes eat the same brand of cat food.