He wears strange clothes, talks to himself, and appears unkempt. Is it any wonder his neighbors view him as an eccentric

A．drawing an analogy between asymmetry in lobsters and handed in humans.
B．developing a method for predicating whether crusher claws in lobster will appear on the left or right side
C．explaining differences between lobsters’ crusher claws and cutter claws
D．discussing a possible explanation for the way bilateral asymmetry is determined in lobsters

A．The development of trade routes through United States cities
B．Contrasts in settlement patterns in United States
C．Historical differences among three large United States cities
D．The importance of geographical situation in the growth of United States cities