Which of the following contributes to protecting the eyes from microbial invasion?
A) Tears contain lysozyme and salt.
B) A mucus layer traps and removes microbes.
C) Tears mechanically flush particles from the eyes.
D) Tears contain lysozyme and salt and mechanically flush particles from the eyes.
E) Tears and mucus combine to trap microbes and remove them.
D
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In a fungus, a complex multicellular reproductive structure is called a(n):
a. hypha. b. gametangium. c. fruiting body. d. oogonium. e. antheridium.
Mammals and birds are descendents of reptiles, but are not included within the taxon Reptilia. As a taxon Reptilia is
A. polyphyletic. B. polygenetic. C. paraphyletic. D. a supergroup. E. a kingdom.
Fertilization is indicated by
a. A. b. B. c. C. d. D. e. E.
A zoo in Southern California has been successfully breeding arctic wolves and they want to exchange some of their extra wolves for kangaroos from a zoo in southwestern Australia. Since it is July, it is quite cold in the other zoo compared to Southern California. What discussion might the zookeepers have about transferring the wolves?
A. After growing up in Southern California, the individual wolves have lost their ability to adapt to cold temperatures, but their progeny will still get the cold-adapted genes. B. Although the wolves are genetically adapted to cold weather have not grown their cold weather coats. C. After several generations in Southern California, the wolves have lost their adaptive genes for cold temperatures. D. Since Arctic wolves are well-adapted to cold, this should pose no problems.