Archean and Proterozonic which are both broken into early middle and late periods
<span>Which is the first type of cell to differentiate?
<span>Answer:</span></span>
D. blood cell
The correct answer to this question is this one: they lacked oxygen. The earliest organisms were completely heterotrophic in nature because of the reason that they lacked oxygen. <span>A heterotroph is an organism that cannot fix carbon and uses organic carbon for growth. </span>
Answer:
The correct answer is - electron transport system.
Explanation:
There are 3 main stages of cellular respiration (aerobic) that are Glycolysis, the Kreb's Cycle and the ETS or Electron Transport Chain. The formation of energy in ATPare as follows:
Glycolysis - glucose > 2 Pyretic Acid Molecules =>2 ATP and Hydrogen
The Krebs Cycle - Citric Acid (a derivative of Pyruvic Acid) > 2 ATP in 4 cycles and Hydrogen, carbon dioxide and water.
The Electron Transport Chain > electron carrying Hydrogens > releases the energy as 4 ATP and water
Thus, the correct answer is - The Electron Transport Chain is the stage that produces most of the ATP during cellular respiration.
