Evolution refers in general to the process through which species change across generations

The term identical twins should not be used because recent epigenetic research has shown that after conception there is a gradual accumulation of genetic

A) differences between identical twins. B) similarities between identical twins. C) differences between identical and fraternal twins D) similarities between identical and fraternal twins E) differences between male and female twins.

Which of the following is MOST accurate about methadone and heroin?

a. They cannot cross through the placenta to the unborn child. b. They can cause excessive birth weight. c. They can cross through the placenta but cannot cause addiction in the fetus. d. They can readilycross through the placental membrane to the fetus.