It would be the endocrine system.
<span>Messages to the brain travel along the nerves, which are strings of long thin cells called neurons</span>
Crossing over? That involves the random exchange of chromosomes.
In population genetics, gene flow (also known as gene migration or allele flow) is the transfer of genetic variation from one population to another. ... In some cases migration may also result in the addition of novel genetic variants to the gene pool of a species or population.
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In biology, evolution is the change in the characteristics of a species over several generations and relies on the process of natural selection. The theory of evolution is based on the idea that all species? are related and gradually change over time.
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