B. because they are not manufactured by the body
The mitochandria's main function is to produce ATP through cellular respiration.
Whenever the sperm and the egg combine, it is possible for one or the other to not split properly and bring 2 of the chromosomes instead of just 1
Answer:
Cellular respiration
Explanation:
All living cells strictly require energy in form of ATP to perform their cellular functions. This energy is obtained when food molecules are broken down on their cells in order to release the stored energy in their bonds. This anabolic process is called CELLULAR RESPIRATION.
CELL CYCLE is one of the cellular functions performed by a cell, as every cell needs to undergo division. According to this question, the cell cycle requires energy, which is also supplied via the process of CELLULAR RESPIRATION.
It is gotten from the atmosphere by respiration, burning of fossil fuel, decay, excretion and decomposition of organic matter, fossilization etc
