Cyanobacteria seems to have evolved relatively early in earth’s history. what happened to the oxygen the earliest cyanobacteria released? it allowed for more complex life forms to evolve. it reacted with iron in the earth’s crust. it formed the ozone layer. it built up in the atmosphere.

Option A

Explanation:

Cyanobacteria were the first organism to produce the most important component of life that is oxygen.

The atmosphere earlier deprived of oxygen due to which there were no multi cellular organism at that time.

Due to the evolution of cyanobacteria there is an evolution of more complex life forms on earth. Multicelluar organism are more complex than unicellular organism that evolved after cyanobacteria.

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.