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Answer:
a. Centromere
A centromere is a specialised DNA sequence of a chromosome that links pair of sister chromarids (a dyad)
It is during the phase cytokinesis that the cell membrane separates the cell into two.
The limbic system is responsible for controlling learning and emotional behavior
ATP is the cell's energy, the mitochondria (aka the power house of the cell) is what produces ATP. The process is called Cellular Respiration.