The osmoregulatory/excretory system of an earthworm is based on the operation of _____
A) protonephridia
B) metanephridia
C) Malpighian tubules
D) nephrons
B
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The motor division of the PNS in a vertebrate can be divided into
A. the brain and spinal chord. B. the sympathetic and parasympathetic systems. C. the central nervous and sensory systems. D. the somatic and autonomic systems. E. muscles and glands.
Changes in sediment distribution can be attributed to all except:
a. currents. b. burrowing animals. c. feeding activity of predators. d. temperature - salinity shifts.
Why is it important to sequence bacterial genomes?
What will be an ideal response?
Which of these humans is the "fittest" as far as natural selection is concerned?
A) a person who lives to the age of 105 and has two children B) a very popular film star who is still alive, is very rich, and has three children from three spouses C) a person who lives to the age of 110 and has no children D) a person with seven children who is killed in an automobile accident at age 40