The asteroid impact of about 65 million years ago led to the extinction of
a. sequoia trees.
b. giant redwood trees.
c. dinosaurs and some other life forms.
d. giant squid.
e. undersea creatures similar to the "Loch Ness Monster."
C
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The main DISADVANTAGE of excessive gluconeogenesis during prolonged postabsorptive periods is that
A. continued protein breakdown can impair enzymatic activity and plasma membrane functions. B. carbohydrate buildup in the liver impairs its function. C. the brain is exposed to levels of glucose that are too high. D. tissues other than the brain increase glucose utilization. E. glucose absorption from the gut is impaired.
In the male reproductive system, the ____________________ secretes a milky, alkaline fluid that neutralizes acidic
vaginal secretions and enhances sperm viability Fill in the blank(s) with the appropriate word(s).
The observation that most aquatic animals, like fish, penguins, and whales, all have streamlined bodies and fins or flippers for steering are a result of
A. sexual selection. B. artificial selection. C. analogous selection. D. vestigial selection. E. convergent evolution.
Suppose you are trying to estimate the following regression: Yi = ?0 + ?1X1i + ?2X2i + ?3X3i + Ui, with an instrument for Zi for X2i. All of the following variables will be included (on the right- and left-hand side of this regression) in the second stage of two-stage least squares except for which one?
A. Yi B. X2i C. X3i D. X1i