When people interact in an effort to receive a reward or a return for their actions, a(n) has taken place.
a.
exchange
c.
barter
b.
division of labor
d.
both b and c

Suppose that b. madurai is commonly collected in freshwater areas near boat harbors and marinas but is haraely found in pristine waters. first, design an experiment that tests an adaptation of b. madurai to some aspect of its environment. in your design, be sure to include a question to test, a hypothesis, and a plan for how you will collect and analyze data.