Artificial lighting affects sleep by breaking down ____.

Some researchers restrict the possibility of self-aware consciousness to species that ____.

The major disadvantage of a blood-brain barrier is that ____.

Today, adolescence has been redefined as a time of _____, rather than _____.

Generally, ____ show the least anxiety about death.

Genes are arranged in specific locations and in a specific order along __________ chromosomes.

Approximately _____ percent of lesbians are parents.

Wom works best on inherently __________ products.

With the transition to toddlerhood, attraction to __________ declines and __________ improves.

With age, children become better at ignoring ________________ stimuli.

When toddlers say ""meh"" for milk, ""na-na"" for banana and ""dah"" for dog, they are using ____.