Which makes bacterial infections difficult to defeat?
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a. bacteria live in viruses.
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b. bacteria live outside of cells.
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c. macrophages work slowly.
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d. killer t cells must attack host cells.

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

What are two reasons for why a species might disappear from the fossil record?

Explain the difference between incomplete dominance and codominance