Air is continuously forced through tubes that thread
through vascularized tissue in a pair of inelastic
lungs in
a. some fish.
b. amphibians.
c. birds.
d. reptiles.
e. some small mammals.
Answer: c
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Flycatcher birds that migrate from Africa to Europe feed their nestlings a diet that is almost exclusively moth caterpillars. The graph below shows the mean dates of arrival, bird hatching, and peak caterpillar season for the years 1980 and 2000. The shift in the peak of caterpillar season is most likely due to _____. A) pesticide use B) earlier migration returns of flycatchers C) an innate change in the biological clock of the caterpillars D) global warming E) acid precipitation in Europe
What processes gave rise to the reproductive isolation between Caribbean and Pacific marine organisms on either side of Central America? Discuss both biotic and abiotic processes in your answer
What will be an ideal response?
At these checkpoints a cyclin works with a cyclin-dependent kinase (i.e cdk) to regulate the checkpoint.
a. true b. false
Which of the following is the proper sequence for mitosis (I. metaphase, II. telophase, III. prophase, IV. anaphase)?
A) III, IV, I, II B) I, III, IV, II C) III, I, IV, II D) I, II, III, IV E) IV, I, III, II