The morphospecies concept is broadly applicable but has disadvantages. Which of the following scenarios illustrates a disadvantage of using appearance to distinguish species?
A. Two beetles are almost identical except that one has larger antennae. Scientists disagree whether this difference is sufficient to name the two beetles as different species.
B. Dogs are highly variable yet can interbreed.
C. Some butterflies in the Amazon are almost identical, yet biologists have determined from phylogenetic analysis that they have arisen from different groups within the butterflies.
D. All of the listed responses are correct.
Answer: D. All of the listed responses are correct.
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Tropical areas absorb more heat than they lose and polar areas lose more heat than they gain. How is it that the tropics do not continue to get warmer and the poles don't get colder with time?
What will be an ideal response?
Sexual reproduction
a. leads to uniform characteristics within a population. b. results in new combinations of genetic traits. c. creates genetic clones. d. requires less tissue differentiation than asexual reproduction. e. produces genetic clones and requires less tissue differentiation than asexual reproduction.
The function of which of the following structures is NOT directly related to diffusion or active transport across its membranes?
(A) Aorta (B) Small intestine (C) Nephron tubule (D) Capillary (E) Alveolus
Which type of microorganism shows even growth throughout thioglycolate broth?
a. obligate aerobe b. facultative aerobe c. aerotolerant anaerobe d. microaerophile