Perfect flowers must have
a. reproductive structures of both sexes.
b. petals.
c. sepals.
d. an attractive scent.
e. all of these.
Answer: a
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Ok at the schematic diagram of a simple self-replicating system. Such a system demonstrates that:
a. natural selection is occurring. b. replication is occurring given specific substrates. c. replication can occur independent of substrates. d. variation can be induced in a system.
Protonephridia are found in
a. annelids. b. mammals. c. flatworms. d. insects. e. adult mollusks.
Assume that there are 335,104 new cases of gonorrhea reported among the U.S. population. When calculated, this would be 115.2 per 100,000 or approximately 1 reported case per 1,000 population. The value represents ________.
A. incidence rate B. morbidity rate C. mortality rate D. prevalence rate
An apparent departure from the rule that species diversity increases toward lower latitudes is the decrease in species of mammals as one moves southward on the peninsula of Baja California. What factor might account for this southward decline?
A) increased intensity of competition B) increased intensity of predation C) increased dispersal distance from the continental source of species