The weakest symbiotic attachment, in which one species simply lives better in the presence of another species that is relatively unaffected is called:
a. commensalism
b. competitive exclusion
c. mutualism
d. predation
e. parasitism
Answer: a. commensalism
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Several species of sea urchins may inhabit the same tide pool and their reproductive periods overlap. Although they practice external fertilization, they seldom interbreed because eggs produce chemicals that are only attractive to sperm of their own species. This is an example of a _________ barrier that _______________.
A. prezygotic; causes geographic isolation B. prezygotic; causes temporal isolation C. prezygotic; prevents gamete fusion D. postzygotic; prevents zygote fusion E. postzygotic; causes hybrid infertility
Which of the following is a property of all living organisms?
a. Reproduce using RNA. b. Use the sun to fuel metabolic processes. c. Grow and develop based on inherited RNA. d. Respond to stimuli in the external environment.
DDT was used in the U.S. in the ____ industry
a. plastics b. agricultural c. paint d. manufacturing e. weapons.
In science, all results ____
a. are accepted as fact b. are only hypotheses c. have a probability of being incorrect d. must be consistent with previous knowledge e. are uncritically accepted by other scientists