Why do animals (including you) need oxygen? a. It binds with low energy electrons and protons to make water b. It carries energy in the electron transport chain. c. It binds with carbon to make carbon dioxide. d. Red blood cells need oxygen to deliver other nutrients to cells.

Option-A

Explanation:

With the evolution of oxygen on Earth, the anaerobic organisms evolved themselves to use oxygen but still, 75% of the anaerobic organism died at the time when oxygen evolved.

The oxygen was used as the electron acceptor in the last phase of the electron transport taking place in the mitochondria. The oxygen binds with the low energy electron at the end of the chain reaction and with the protons and forms the water molecule. This water is known as the metabolic water.

Thus, Option-A is the correct answer.

21 stacks

step-by-step explanation:

divide 630/30

21 stacks

enjoy!

answer: decrease

a limiting factor is the one which decrease the abundance, distribution and causes extinction of the population of species in a ecosystem. here, predators including hawks, owls and snakes are the limiting factor for the population of mexican free tailed bat.   although bats are nocturnal animals as they forge for food at night these predators also may remain active during night which can decrease the population of the mexican free-tailed bats. also, these bats eat only one type of insects that are moths. the food can also be a limiting factor as all 400 members are dependent upon same type of food needs that are moths. the decrease in the moth population can cause decrease in population size of the mexican free-tailed bats.

therefore, the scenarios will most likely to decrease the population size of the mexican free-tailed bats.