There is no pigment in the brain, so it is in it's natural colour, grey.
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<em>Only individuals with an aa genotype will express a recessive trait; therefore, offspring must receive one recessive allele from each parent to exhibit a recessive trait. One example of a recessive inherited trait is a smooth chin, as opposed to a dominant cleft chin.
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d. enzymes increase the rate of chemical reaction by providing activation energy to the substrate
A: Taxon.
The terms order and class both refer to 2 specific levels that are a part of Linnaeus' classification systems.
