The type of skeleton that is usually composed of either a calcium-containing shell or chitin is a(n)
A. endoskeleton.
B. exoskeleton.
C. hydrostatic skeleton.
D. gastrovascular cavity.
E. vascular canal.
B. exoskeleton.
Biology & Microbiology
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The process by which cells acquire specialized forms and functions is called
A. cell growth. B. cell elasticity. C. cell differentiation. D. cell replication. E. None of the choices are correct.
Biology & Microbiology
Which of the following is not a lipid?
a. Fatty acid b. Glucose c. Oil d. Steroid e. Wax
Biology & Microbiology
Which of the following is a physiological mechanism used by endotherms to dissipate heat?
a. basking b. contact with hot surfaces, such as rocks c. vasodilation d. group activities that generate heat
Biology & Microbiology
Smoking may increase your risk of lung cancer, but it does not affect the risk of bladder cancer.
a. true b. false
Biology & Microbiology