The structures labeled “A” and “C” in the figure are
a. dikaryotic hyphae.
b. gametangia.
c. of different mating strains.
d. zygospores.
e. all of these.
Answer: c
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Macroscopic fossils of organisms thought to be animals first appeared in rocks deposited around _____ million years ago
A. 575 B. 542 C. 420 D. 360 E. 100
Imagine an earthworm that has no chaetae. How would the lack of chaetae affect movement of the earthworm?
A. The earthworm would be much flatter than normal since it has no hydrostatic skeleton. B. The earthworm would only be able to extend its body segments. C. The earthworm would only be able to shorten its body segments. D. The earthworm would have difficulty changing locations, since it cannot anchor itself in the soil. E. The earthworm would not be able to move at all.
Floods and fires are examples of ________, which can dramatically and unpredictably reduce populations
A) demographic factors B) density-dependent factors C) logistic growth factors D) environmental resistance E) biotic factors
Which of the following is least important in deciding whether a fossil should be classified as a hominin?
A) tooth structure B) brain size C) bipedalism D) slope of the face