Down syndrome is caused by

A change in type or kind is a/an:

Bayley has one X chromosome and one Y chromosome. Therefore, Bayley is a(n)

Why is the study referenced in “Three Identical Strangers” unethical?  

________ is a hormone that initiates uterine contractions and stimulates other hormones, like estrogen, that regulate uterine contractions.

After explaining to parents and children the purpose of the research project, how it will be conducted, and the risks and benefits expected, the researcher must obtain ________ from parents and children.

The embryonic period is the time when

To avoid SIDS, experts recommend

Noam Chomsky used the term ________ to describe structures and processes in the brain that are specifically designed for learning language.

Distress reactions to individuals other than primary caregivers are referred to as