What is the function of the nucleus? A. It supports and protects the contents of the cell.
B. It contains all of the cell's genetic material.
C. It supplies nutrients and water to the parts of the cell.
D. It controls what travels in and out of a cell.

B

Explanation:

the nucleus act as the brain of a cell and contains all the important buiz like genetic material.

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

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