The final electron acceptor in aerobic respiration is:
a. water
b. carbon dioxide
c. oxygen
d. nad and fad

The correct answer will be option-C.

Explanation:

Cellular respiration is a slow process which oxidizes food to form energy molecules like ATP.  The process proceeds in four steps: Glycolysis, pyruvate decarboxylation, citric acid cycle and electron transport chain.

During the electron transport chain, the electrons from the reducing equivalents like NADH and FADH₂. The electrons move downhill by electron acceptors which gets reduced and lose the energy. The electron is finally accepted by an oxygen molecule which forms metabolic water after reacting with free hydrogen atoms.

Thus, Option-C is the correct answer.

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.