In the United States, __________ of adults live alone

How manychromosomes does a normal person have?

A) about 100,000 B) 46 C) 23 D) 2

How long does it take chicks to adapt to visual displacement accomplished by

putting lenses over their eyes? (a) virtually no time at all; their genetic prewiring takes over and readjusts their visual system (b) a few minutes (c) a few hours (d) a few days (e) they never adapt to such displacement; they continue to peck at where food seems to be instead of where it is