An embryo grows into a multicellular organism made of a wide variety of cell types. how does the variation in cell types occur?

Variation occurs in germ cells i.e. sperm and egg, and also in somatic (all other) cells.

Explanation:

i would say the prokaryotic cells the prokaryotic cells are less complex, are usually found only in unicellular organisms and have more limited capabilities than eukaryotic cells.

it also supports my hypothesis. if you rest first you can squeeze the clothespin more times. from the data i collected the average of the eight people concluded exercise makes your muscles more fatigued and less able to squeeze the clothespin compared to resting before squeezing.