MZ twins result when the zygote separates and yields two embryos in ________ after conception.

a) weeks eight or nine
b) the first two weeks
c) the second trimester
d) weeks four or five

Ans: b) the first two weeks

Psychology

You might also like to view...

________ can create serious side effects for older adults which, in turn, lead to negative consequences such as decreased ability to drive safely and increased falls.

a. Benzodiazepines b. Antipsychotics c. MAOIs d. SSRIs

Psychology

Buspirone (BuSpar) has

a. been shown to be comparable to benzodiazepines in the treatment of anxiety b. the same basic molecular structure as benzodiazepines c. been shown to be cross tolerant with benzodiazepines d. all of the above

Psychology