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After the macrophage fails the Helper T Cell stimulates the B cells if pathogen is extracellular and Cytotoxic T Cells if the pathogen is intracellular. Once the pathogen is killed the B Cells create Memory B Cells and the Killer T Cells create memory T Cells.
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When populations have differences in rituals or behaviors. When populations are separated by rivers, mountains, r bodies of water.
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The children's father must also carry the recessive allele. Recessive alleles only determine characteristics when a child inherits a copy from each parent.
The answer is C. Nondisjunction. This happens when cells cannot separate chromosomes correctly.