The sites of hematopoiesis in the developing embryo in the correct temporal order is which of the following?
a. yolk sac, fetal liver, bone marrow
b. yolk sac, aorta, fetal liver
c. fetal liver, bone marrow
d. yolk sac, placenta, bone marrow

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

Monitor and apply fix up stratorgies

Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine