Conservation biologists are often concerned that when the population size of an endangered species becomes too small, it is at risk of extinction for which reason?
A. They are at risk of sympatric isolation.
B. They can no longer evolve.
C. They may be more susceptible to changes in the environment or disease.
D. They are at risk of developing prezygotic barriers to reproduction.
E. Their rate of breeding will decline.
C. They may be more susceptible to changes in the environment or disease.
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Which term denotes the conditions, resources, and interactions necessary for survival and reproduction of a species?
a. habitat b. niche c. carrying capacity d. community e. ecosystem
Plaque is caused by many organisms but one of the
main causes is a. fungal chitin. b. protistan lipids. c. algal alginates. d. extracellular products of bacteria e. all of these.
Goiter, an abnormal enlargement of the thyroid gland, is caused by a dietary deficiency in:
A) tyrosine B) iodine C) potassium D) salt
If a female orchid bee has just left a Brazil nut tree with nectar in her stomach, and if she visits another flower on a different Brazil nut tree, what is the sequence in which the following events should occur?
1. double fertilization 2. pollen tube emerges from pollen grain 3. pollen tube enters micropyle 4. pollination A) 4, 2, 3, 1 B) 4, 3, 2, 1 C) 2, 4, 3, 1 D) 2, 4, 1, 3