The fact that exposure to a teratogen during the period of the ...

[TVarnum]

The fact that exposure to a teratogen during the period of the zygote often leads to a spontaneous abortion (miscarriage) while the same exposure during the period of the fetus can lead to minor defects of bodily structures or systems demonstrates that
 
  a. the impact of teratogens depends on the genotype of the organism
 b. the impact of teratogens changes the course of prenatal development
 c. different teratogens affect different aspects of prenatal development
 d. the impact of a teratogen depends on the amount, or dose, of the teratogen

Question 2

One reason why children might associate more with peers of their own sex is because they
 
  a. may be more likely to share similar play styles.
  b. see more same-sex friendships represented on children's television programs.
  c. are taught by their parents to show such a preference.
  d. have a biological preference for same-sex peers.

[lou]

Answer to Question 1

b

Answer to Question 2

a