What effect is warming predicted to have on migration behavior?
A) Birds will depart for migration earlier and return later.
B) Birds will depart for migration later and return later.
C) Birds will depart for migration earlier and return earlier.
D) Birds will depart for migration later and return earlier.
C
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Which of the following best describes the number of distinct evolutionary branches in the domain
Bacteria, as revealed by genome sequencing studies?
a. 3?4 b. 6?7 c. 9?10 d. at least 12 e. at least 20
Compare and contrast the three types of muscle tissue. What will be an ideal response?
Which observations of species distribution across Earth support the theory of common descent?
A) All continents contain nearly identical organisms. B) Each part of Earth contains life forms perfectly designed for that region. C) One can see similarities in organisms that are found in close proximity, but each population has adaptations that suit the organisms to their particular habitat. D) There are very few similarities among life forms on different tropical islands.
Evolution is sometimes described as the change from preexisting life-forms to modern-day organisms. What actually changes, in every case of evolution, is the
A) ability of organisms to respond to external stimuli. B) energy and nutritional demands of the organism. C) species' physical appearance. D) rate of reproduction. E) genetic makeup of the species, due to mutations.