Which mass extinction led to the disappearance of the dinosaurs?
a. K–T mass extinction c. Triassic mass extinction
b. Permian mass extinction d. Devonian mass extinction
A
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The blood pressure in your brachial artery is at its lowest during
A. the time the aorta is maximally stretched. B. the diastolic period. C. exercise. D. the systolic period. E. ventricular contraction.
When geographic isolation occurs, under what conditions might you expect the most rapid speciation?
A) when there is similarity in the food supply in both locations B) when the climate is very different in the two locations C) when the species has a long generation time D) when one of the two groups becomes extinct
What is the purpose of a buffer?
a. To convert an acid to a base b. To minimize the change in pH c. To measure the acidity of a solution d. To form a stable bond between atoms e. To maintain a constant internal temperature
Which of the following is the role of calcium-dependent protein kinases?
A. receptor molecule B. effector molecule C. messenger molecule D. affector molecule E. All of the choices.