Two species of toads have been successfully interbred in a laboratory but do not hybridize in nature because one species mates in summer and the other mates in the fall. This is an example of ____ isolation.
a. reproductive
b. ecological
c. inbred
d. physical
e. genetic
ANSWER: a. reproductive
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Instantaneous speciation (select all correct choices)
A. is, by definition, a type of sympatric speciation. B. is typically caused when hybridization between species produces fertile, viable offspring that are reproductively isolated from both parental species. C. often involves the multiplication of chromosome sets, or polyploidy. D. is relatively common in plants but not in animals. E. none of these
In times of stress, the sympathetic nervous system decreases blood pressure
Indicate whether the statement is true or false.
A diatom's ________ is a glassy cell wall
a. valve b. heterokent c. mastigonemes d. frustule
A bacterium that uses the oxidation of inorganic compounds to provide energy for manufacturing nutritious organic
compounds is a: a. parasite. b. pathogen. c. saprotroph. d. chemoautotroph. e. photoautotroph.