Some species of shark allow small fish to enter their mouths unharmed. inside the shark's mouth,
the small fish feed on debris around the teeth. the shark's teeth are cleaned, which reduces the risk
of decay and infection. which term describes chis interaction?
a. predacion
b. mutualism
c. parasitism
d. commensalism

In german cockroaches, curved wing (cv) is recessive to normal wing (cv+). bill, who is raising cockroaches in his dorm room, finds that the frequency of the gene for curved wings in his cockroach population is 0.6. in his friend joe’s apartment, the frequency of the gene for curved wings is 0.2. one day joe visits bill in his dorm room, and several cockroaches jump out of joe’s hair and join the population in bill’s room. bill estimates that, now, 10% of the cockroaches in his dorm room are individual roaches that jumped out of joe’s hair. what is the new frequency of curved wings among cockroaches in bill’s room? 0.69 0.4 0.5 0.31 0.20