Answer: crossing over
during the process of fertilization, a sperm and egg join together to create a zygote. since a sperm had half the number of chromosomes and an egg has half the number of chromosomes, when they join together the zygote had a complete diploid set of chromosomes. the assortment of chromosomes and crossing over promotes genetic variation during the process of reproduction
Pretty sure its a.) the umbilical cord carries the metabolic waste from the fetus to the placenta where it diffuses into the maternal blood.
Bc metabolic waste just goes from the umbilical cord to the mothers blood
The answer is a
please mark me brainliest, comment if you need explanation
Answer:
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Answer:B. the motion of its particles
