What is an example of a +/+ interaction?
A. competition
B. mutualism
C. commensalism
D. parasitism
E. ammensalism
B. mutualism
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If the multiregional hypothesis of human origins is correct, modern human populations last shared a common ancestor around _____ years ago. If the out-of-Africa hypothesis is correct, we last shared a common ancestor around _____ years ago
A. 2 million; 200,000 B. 3.2 million; 2 million C. 5-7 million; 2 million D. 5-7 million; 200,000 E. 3.2 million; 200,000
Humans contract Chagas disease when the reduviid bug defecates while taking a blood meal and the parasites in the feces are rubbed or scratched into the bite wound or onto mucosal surfaces. Which stage in the blood infects the host cells?
a. Amastigote b. Epimastigote c. Trypomastigote d. Promastigote
Which of the following is NOT normally considered
a temporary method of contraception? a. birth-control pills b. vasectomy c. condoms d. IUD plus spermicide e. spermicidal jelly or foam
Heritability can only be measured for
A) traits with phenotypic variance. B) traits with genotypic variance. C) discrete traits. D) polygenic traits. E) None of these