Evolution occurs in
A. individuals.
B. communities.
C. species.
D. genotypes.
E. alleles.
Ans: C. species.
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Biologists generally classify animal behaviors by
A. both the way the organism acquired the behavior and how changeable the behavior is in the organism. B. the way the organism acquired the behavior. C. the number or proportion of the species that displays the behavior. D. how specific or general the behavior allows the organism to interact within its environment. E. how changeable the behavior is in the organism.
This hormone causes the uterus to contract and the breasts to release milk.
A. androgens B. oxytocin C. estrogen D. follicle-stimulating hormone
Public health scientists discover and become concerned about a new strain of RNA virus among farm animals, especially geese and pigs, in the Midwest. Each virion is composed of lipid, helical proteins, and multiple pieces of RNA. This new virus may be a(n)
A. rotavirus. B. influenza virus. C. hantavirus. D. dengue virus. E. coronavirus.
The stage in a normal growth curve when cells reach the maximum rate of cell division is the
A. lag phase. B. log phase. C. stationary phase. D. death phase. E. fast phase.