The smallest unit of meaning in a language is the

In developing countries, at what age do individuals typically become grandparents?

a. age 30 years b. age 40 years c. age 50 years d. age 60 years

In some cases, identical twins are disconcordant for schizophrenia. While environmental factors may be the cause of this difference, prenatal factors may also play a part in that _______________ twins would have greater concordance

a. monochorionic b. dichorionic c. monozygotic d. dizygotic