Nematocysts are used for ____.
A. reproduction
B. excretion
C. muscle action
D. circulation
E. capturing prey
Answer: E
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The ability to determine where a sound is coming from depends primarily on
A. differences in sound intensity in the two ears. B. differences in time of sound arrival to the two ears. C. differences in sound frequency received at the two ears. D. differences in both frequency and intensity at the two ears. E. None of these choices are correct.
Which of the following is the least reliable form of contraception?
a. condoms b. sterilization c. withdrawal d. oral hormonal
Four of the following are advantages that led to an evolutionary shift towards bipedalism. Which one is the exception?
a. It allows for more efficient movement across open ground. b. It made upright walking more energy efficient. c. It keeps the body cooler d. It allows the organism to reach higher food. e. It is easier to scan the horizon for predators.
Animals active primarily at night often have _______________layers in their eyes.
Fill in the blank(s) with the appropriate word(s).