Evaluate the claim of a friend that received 100% of their DNA from their mother

False, a person's genetic information is composed from 50% of their mothers and 50% of their fathers.

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

mammal

explanation: