Which two animals are classified as suspension feeders?
a. clams and aphids
b. clams and fiddler crabs
c. lampreys and rabbits
d. lampreys and rabbits
e. gray whales and clams
ANSWER: e
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Which of the following statements about spermatogenesis is false?
A. Sperm are motile as soon as they are produced. B. Secondary spermatocytes and spermatids are linked together by cytoplasmic bridges. C. Spermatogenesis takes 2–3 months. D. Sperm are produced continuously within the seminiferous tubules. E. None of the answer options is false.
The resistance to reinfection with measles virus following recovery from measles infection is called __________.
A) artificial immunity B) natural selection C) passive immunity D) innate immunity E) active immunity
The sharp reduction of the gene pool and the numbers of a population through a severe epidemic is an example of ____.
A. natural selection B. genetic isolation C. the bottleneck effect D. the founder effect E. the wild card effect
Adult giraffes can be up to 20 ft. tall, and thus require special adaptations to maintain appropriate blood pressure. One adaptation is the rete mirabile, a group of blood vessels that form a web or net-like structure to slow blood flow.The giraffe, as the tallest living land animal, has several adaptations for its height. To prevent blood from pooling in the head when it bends down to drink, the jugular veins of a giraffe have multiple one-way valves. Furthermore, a web of arteries and veins in the neck called the rete mirabile ("wonderful net") slows the flow of blood into the brain. These specializations of the ________ act as mechanisms to maintain ________.
A. circulatory system; blood pressure homeostasis B. nervous system; temperature homeostasis C. circulatory system; pH homeostasis D. nervous system; homeothermy