I think it is b
<span>Amphibia, Reptilia, Aves, and Mammalia</span>
Answer:
Drinking alcohol in the first three months of pregnancy can cause the baby to have abnormal facial features. Growth and central nervous system problems (e.g., low birthweight, behavioral problems) can occur from drinking alcohol anytime during pregnancy.
Explanation:
It is difficult to control all variables except the one being tested. Hope this helps.