If two variables change consistently in relation to each other, they are said to ______

What hallucinogen, at high doses, can induce psychotic behavior, including delusional thinking, catatonic behavior, manic excitement, and sudden mood changes?

a. LSD b. PCP c. cocaine d. alcohol

Researchers believe that the greatest incidence of miscarriage occurs during which period?

a. embryonic b. fetal c. germinal d. second trimester