The photic zone in aquatic environments is typically about how deep?
A. 10 m
B. 50 m
C. 100 m
D. 500 m
E. 1000 m
C. 100 m
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Which of the following statements is false?
1.We are in the midst of a slowly increasing trend towards species extinction. 2.Most of the causes of the current species extinction are natural causes. 3.Dodos most likely became extinct because of destruction by animals other than humans. 4.The origins of our current extinction event began tens of thousands of years ago.
The body's "thermostat" is located in the
a. heart. b. spinal cord. c. thalamus. d. hypothalamus. e. cerebellum.
Porifera differ from other animals in that they
A. do not form true organs B. are sessile C. have three germ layers D. have radial symmetry
Sympatric speciation differs from allopatric speciation because in sympatric speciation
A. there are no physical barriers against interbreeding. B. a population becomes geographically isolated. C. hybrid zones form. D. polyploidy must first arise. E. two populations of the same species merge to form a single population.