Answer:
People with one CF allele have an advantage of being less likely to contract typhoid. This helped them survived and pass their trait to their offspring.
Explanation:
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B) the usable energy source for all cells
On Earth, we all know gravity affects everything around us. ... There's no gravity to pull blood into the lower part of the body. Instead, blood goes to the chest and head, causing astronauts to have puffy faces and bulging blood vessels in their necks.
That would be the epithelial tissues
