Which process involves the transfer of heat from the surface of a body to a fluid that passes over the body's surface?
a. convection
b. evaporation
c. radiation
d. conduction
Ans: a. convection
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4. Structures that are shed in one piece include
(a) the cuticle of roundworms. (b) the exoskeleton of arthropods. (c) human hair. (d) all of the above.
The type of contraception that works because ovulation is prevented is:
a. rhythm method b. tubal ligation c. oral contraceptive pills d. the diaphragm e. the condom
Which one of the following is characteristic of an isotonic muscle contraction but not an isometric muscle contraction?
A) generates a force B) moves an object or part of the skeleton C) helps an individual maintain an upright position D) requires energy E) helps an individual maintain posture
Four of the following statements correctly describe lichens. Which statement is the exception?
A. They inhabit harsh environments. B. They contain a club fungus. C. They may have preceded the evolution of land plants. D. They may be a mutualism between an alga and a fungus. E. They can contain cyanobacteria.