What controlsvariations in ski color among humans?
a. a persons diet
b. many genes
c. multiple alleles of a single gene

Which of the following is an important function of child-directed speech? (a) it captures the infant’s attention and maintains communication. (b) it reduces the occurrence of infantile amnesia for the earliest memories of infancy. (c) it reduces the need for reciprocal interaction between caregivers and children. (d) it assists in prolonging rem sleep in infants.

If you are having a hard time lifting something, you should arch your back. a. true b. false

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