Human twin and adoption studies imply that aggressive tendencies in human beings are "<span>at least partly influenced by genetics".</span>
Adoption studies are one of the great devices of behavioral genetics. These studies are used to gauge how much a characteristic shifts in light of environmental and genetic variety. Adoption studies are normally utilized together with twin studies while evaluating heritability.
Because of wide variations in seasonal and annual precipitation
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Canals are also used to transport water for irrigation and other human uses. In California the water supply situation has been relatively unstable
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