Controlled mating of two parents of the same species, with different genotypes, to get the best combination of traits results in
A. a clone.
B. a new species.
C. an interspecific hybrid.
D. an intraspecific hybrid.
D. an intraspecific hybrid.
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What type of pressure is not placed upon the environment as crop production expands? a. Pesticide runoff into the rivers
b. Runoff clogging rivers. c. Increase in irrigation. d. Loss of topsoil. e. Additional habitat available for many species.
All of the following may be involved in feedback
mechanisms in natural communities when populations become too dense EXCEPT a. density-dependent factors. b. limiting factors. c. biotic potential. d. physical factors. e. biotic factors.
Exposure to which of the following antibiotics would cause a child to develop yellow teeth?
a. erythromycin b. tetracycline c. amoxicillin d. streptomycin e. penicillin
Local Staphylococcus aureus infections often involve formation of an abscess.
a. true b. false