At the end of the mitotic cell cycle, a cell divides into two cells. what must happen before the cell divides?
a
the number of organelles doubles.
b
chromosomes must be copied.
c
four nuclei must be formed.
d
the membrane thickens.

humans, along with other animals and plants, have linear chromosomes that are arranged in pairs within the nucleus of the cell. the only human cells that do not contain pairs of chromosomes are reproductive cells, or gametes, which carry just one copy of each chromosome.

all these collisions do one thing, and that thing is explained in the last option. when dusst, rocks and ice collide, they harden and form giant layers of rocks or hard ice.

d)   to harden materials to form different parts of earth’s layers

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bioteacher101

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