Which model of evolution is closest to what was originally suggested by Charles Darwin?
A) Punctuated equilibrium model
B) Graduated model
C) Neither the punctuated equilibrium model nor the graduated model
D) Both the punctuated equilibrium model and the graduated model
B
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How do Hawaiian bobtail squids prevent all bacteria except Allivibrio fischeri from colonizing their light organ?
What will be an ideal response?
In the heart of a fish, where would you expect to find oxygenated blood? Choose all that apply
A. in the right atrium B. in the left atrium C. in the ventricle D. in a single atrium (fish only have one) E. Nowhere; oxygenated blood does not pass through a fish's heart.
A collection of sensory neurons and interneurons that are concentrated together is called
a) cephalization b) a cerebrum c) a nerve net d) a ganglion
Which of the following reagents reacts with crystal violet as the mordant?
A. safranin B. crystal violet C. Gram's iodine D. 95% ethyl alcohol