There are two types of cellular respiration, these are aerobic and anaerobic respiration. Anaerobic respiration can occur in the absence of oxygen, but for aerobic respiration to occur, oxygen must be present. The process of aerobic cellular respiration involves a series of oxidation and reduction reactions and the oxygen molecule serve as an electron donor and acceptor during this process. Thus the stages of cellular respiration can only occur if oxygen is present. <span />
<span>average temperature and precipitation are the two characteristics used to describe the climate of an area</span>
It flows from a high to low concentration gradient across the membrane.
A cell membrane is semi permeable. It has no other function
<span>Answer: Cellular differentiation is responsible for one daughter cell becoming a sieve tube whereas the other becomes a companion cell. Cell differentiation occurs as different genes are switched on and off.
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