Answer:
3. fats
Explanation:
fats are in the food used by animal cells, fats and lipids can be used for things such as storing energy in the cells
hope this helps :)
Answer:
The behavior of chromosomes during meiosis and fertilization is responsible for most of the variation that arises in each generation. Three mechanisms contribute to genetic variation arising from sexual reproduction: independent assortment of chromosomes, crossing over, and random fertilization.
The zygote, a single cell, implants its self to the uterine wall and it developes into an embyro which is a cluster of cells.
