During fertilization, a sperm and an egg fuse together to form a zygote. Each
human gamete cell contains 23 chromosomes. How many chromosomes will be
in a zygote after fertilization? *

[content deleted] - user123802726recklesschicken

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.

voluntary muscles are controlled by the cerebellum.