In addition to disruptive selection on a fitness trait, such as food gathering, sympatric speciation requires:
a. gene flow. c. geographic isolation.
b. assortative mating. d. clinal variation.
B
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Pinworm is a nematode parasite that lives in the human rectum, and causes itching in the anal area. What best explains the itching symptom?
A. Any kind of parasite will naturally irritate the skin. B. The itching induces the person to scratch, helping to spread the parasite to another person. C. The itching is a side-effect when the immune system has successfully attacked the nematode. D. The itching is because of the mismatch between humans and the parasite’s natural host. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about nematode diseases? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Which taxon is not a member of the basal angiosperm group?
a. Ginkgo biloba b. Nymphaeales c. Austrobaileyales d. Amborella trichopoda e. Magnoliales
The rusts and smuts that seriously affect crop plants are
A. basidiomycetes. B. zygomycetes. C. ascomycetes. D. actinomycetes. E. chytrids.
Which patient group is least susceptible to infections by pseudomonads?
A) cystic fibrosis patients B) organ transplant recipients on immunosuppressive drugs C) burn patients D) otherwise healthy mothers in childbirth E) competitive swimmers who train daily