Specific targeting of an antigen is a
characteristic of which line of defense?
a. first
b. second
c. third
d. all of these
e. none of these
C
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Based on the below diagram and other information from your text, what is the most likely (e.g., most parsimonious) explanation for the evolution of flight in vertebrates?
A. The common ancestor of all terrestrial vertebrates was wingless and wings evolved independently three different times: in bats, in pterosaurs and in the common ancestor of birds and dinosaurs.
B. Wings evolved once in vertebrates (e.g., the common ancestor of all terrestrial vertebrates had wings) and wings were subsequently lost in all but three lineages: bats, pterosaurs and birds.
C. The common ancestor of all terrestrial vertebrates was wingless and wings evolved independently three different times: in bats, in pterosaurs and in birds.
D. The common ancestor of all terrestrial vertebrates was wingless and wings evolved independently two different times: once in bats and once in the common ancestor of birds, pterosaurs and dinosaurs.
E. The common ancestor of all terrestrial vertebrates was wingless and wings evolved independently three different times: in bats, in birds and in the common ancestor of pterosaurs and dinosaurs.
Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?
Gather Content
· What do you know about the evolution of flight in vertebrates? What other information is related to the question?
Choose Answer · Given what you now know, what information 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 of the following is TRUE of the penis and the clitoris?
A. Unlike the clitoris, the penis is erectile. B. Both the penis and clitoris comprise a shaft and a glans. C. Unlike the penis, the clitoris has few or no nerve endings. D. Both the penis and clitoris play a known role in reproduction.
Which time period would hold the record of the oldest fossils of multicellular animals, found in mountainous areas of
South Australia, and parts of Canada and China? a. Edicarian b. Devonian c. Cambrian d. Cretaceous e. Ordovician
Organisms that are unicellular, colonial, filamentous, and photosynthetic would include the
A) fungi. B) protozoans. C) helminths. D) algae.