26. which of the following is true regarding the electron transport chain step of cellular respiration?
a. absolute anaerobic step
c. occurs outside of mitochondria
b. diffusion created h+ gradient
d. nadh/fadh2 used as energy

If we assume that, in the african savanna, rainfall and the amount of grass is plentiful, what other factor would best explain a reduced antelope population?

If you see a sedimentary outcrop and red layers of sand are at the top of pale layers of rock, what does this tell you about the ages of the rock layers?

Maria wanted to grow a fern in her backyard. acting on a suggestion from a friend, she collected brown dots from the underside of a fern’s leaves and then potted them. after a few days, maria saw small fern leaves erupting from the pot. which statement explains this phenomenon?