Which of the following was the most recent to evolve?
A. angiosperms
B. gymnosperms
C. seedless vascular plants
D. bryophytes
E. green algae
Answer: A. angiosperms
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A person with an unapparent infection who shoes no symptoms of being infected yet is able to pass the disease on to others is called a(n) _____carrier
Fill in the blank(s) with the appropriate word(s).
Curtis’s contention that if the last blue whale were to
choke on the last panda bear and it still would not be the end of the world was his way of a. stressing the improper attitude of some environmental activists and to encourage the drilling for oil in Alaska. b. stressing the importance of some bacteria to the biosphere. c. encouraging the study of endangered species. d. shocking an audience into the study of conservation biology. e. doing none of these.
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.
Twenty-three years separated Darwin's return from his voyage on the HMS Beagle and his publication of On the Origin of Species. What is the reason(s) for this gap?
a. Darwin knew his ideas were revolutionary and he wanted a strong case before unveiling them. b. Darwin worked to amass a great body of both observational and experimental evidence in support of his theory. c. Competition pressured Darwin into publishing. d. B and C, but not A.