The nearest living relatives of crocodiles and alligators are
A. birds.
B. lizards.
C. snakes.
D. turtles.
E. manatees.
Answer: A
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True or false: Elements in the same horizontal row in the periodic table have the same number and type of electron orbitals
A. true B. false
During which meiotic phases does oogenesis arrest?
A. prophase I and metaphase II B. prophase I and prophase II C. metaphase I and prophase II D. metaphase I and metaphase II E. metaphase I and anaphase II
Integrins are unusual in that they:a
are steroids. b. are specific transmembrane proteins. c. respond to information received from inside and outside the cell. d. stimulate both the Ras pathway as well as the IP3 pathway. e. are found only in Arabidopsis thaliana.
The insects in the diagram above represent all of the following except
A. herbivores.
B. the second trophic level.
C. primary consumers.
D. producers.