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.

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.