Intrasexual selection leads to the evolution of
A. novel parental care possibilities.
B. structures in males that are used in combat with other males.
C. bright plumages, for example, by males to attract females.
D. nesting activities between the two parents.
Answer: B
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Which animal uses positive pressure breathing to ventilate its lungs?
a. human b. lizard c. bird d. cat
e. salamanderPseudogenes are evidence of
A) gene duplications. B) integrated viruses, or proviruses. C) natural selection for functional genes. D) de novo genes. E) proteins that are produced but have no function.
Recombinant DNA is any DNA that ____.
A. has been cut by restriction enzymes B. is at least four to eight base pairs in length C. has had its gene sequence rearranged D. consists of DNA from two or more organisms of the same or different species E. inserted into plasmids
The shoulder joint where the humerus meets the pectoral girdle is an example of a
A) hinge joint. B) ligament. C) pivot joint. D) ball-and-socket joint.