Why would you have bothered to spend 10 years looking for a fossil ancestor of your new species?
A. to calibrate the time scale of your
phylogeny that is based on
molecular/anatomical data.
B. to reconstruct the environment, and
possible selective pressures, on these
lineages.
C. to better understand anatomical changes
that occurred during the evolution of this
lineage.
D. None of a-c are correct.
E. All of a-c are correct.
E
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The results in Figure 18-3 support the conclusion that:
a. natural selection does not occur in guppies.
b. natural selection can occur in guppies within a few generations.
c. predation is not a selective force in determining the average size of guppies.
d. male body weight increased proportionately more than female body weight.
e. in the experimental setting, the guppies produced fewer, larger offspring
A rise in the blood concentration of hydrogen ions will make the blood more acidic and cause a(n) ________ to restore homeostasis
A) increased vagus nerve impulse B) relaxation of the diaphragm C) increased breathing rate D) decreased breathing rate
A drug called Coumadin interferes with the action of vitamin K in the liver. What effect will Coumadin have on blood-clotting mechanisms?
A) Coumadin will make it necessary for the patient to eat extra leafy green vegetables. B) Vitamin K will not be absorbed from the digestive tract. C) The liver will not be able to produce needed clotting factors. D) Nothing, because vitamin K is not necessary for blood clotting.
Antibiotics bind to RNA polymerase and
A) act as base analogs B) inhibit cell wall synthesis C) disrupt cell membrane function D) inhibit transcription