Prezygotic mechanisms lead to reproductive isolation by preventing the formation of
A. hybrid zygotes.
B. somatic cells.
C. fertile sperm or pollen cells.
D. fertile eggs.
E. mating pairs.
Answer: A
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Four of the five answers listed below are functions of parenchymal tissue. Select the exception
a. conduct water b. wound healing c. food storage d. conduction of photosynthesis e. secretion
Paleontologists have found fossils dating back 3.6 billion years. These closely resemble
a. nothing alive today. b. blue-green algae present today. c. small invertebrate animals. d. today's simplest plants. e. fungi.
What causes the disease tuberculosis?
A) a particular type of virus B) a particular type of bacteria C) exposure to polluted air D) genetics
In which of the following habitat types would species diversity be expected to be relatively low?
a. high environmental stress b. low environmental stress c. continental ecosystems d. ecotones e. mature successional communities