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learn about the structure and function of genes.

is greater among adopted children whose biological parents did not abuse drugs.

shift over time and differ from one culture to another.

,”13. One study of 1.1 million people identified 1271 gene variations that together predicted about 12 percent of the differences in

in both males and females; only in females

only in males; only in females

stress; least likely to benefit from

strengthen our memories of the preceding day’s events.

consolidate memories and process emotional information.”

nature selects traits that best enable us to survive in a particular environment.”