Social behavior between animals where the actor benefits at the expense of the recipient is called ________
A) mutual benefit
B) selfishness
C) altruism
D) spite
B
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Answer the following statements true (T) or false (F)
1. Animals are monophyletic. 2. The terms "dorsal" and "oral" are synonyms. 3. A pseudocoelom is a cavity that develops embryonically into the coelom. 4. Gastrulation is the development of the gastrula into an embryo. 5. A hydrostatic skeleton has no bones or cartilage.
A chronic, local allergy such as hay fever is considered ________.
A. systemic anaphylactic B. atopic C. delayed D. T-cell-mediated E. antibody-mediated
Organisms that require high salt concentrations for growth are called
A. thermophiles. B. obligate halophiles. C. acidophiles. D. anaerobes.
Which statement about natural selection is true?
A. It can have an evolutionary effect only if phenotypic differences are heritable. B. It is the same as evolution. C. It acts directly on genotypes. D. Changes in allele frequencies can occur only because of natural selection. E. It always results in reduced genetic variation.