If a tree's heartwood rots out, the tree will
A) not survive because the active xylem is destroyed.
B) not survive because the active phloem is destroyed.
C) replace the heartwood with sapwood to compensate for the damaged tissue.
D) be weaker than normal and more likely to blow over in a storm.
D
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The early symptoms of rabies generally begin
A. 1 day after viral entry. B. 1-2 months after viral entry. C. 6 months after viral entry. D. 1 year after viral entry.
During the Gram stain, the application of alcohol results in the decolorization of ______ cells.
A. gram-negative B. pleomorphic C. all D. gram-positive
The atrioventricular valves are closed when the
A) right atrium is contracting. B) P wave of an electrocardiogram appears. C) heart is completely relaxed. D) ventricles contract. E) ventricles are relaxed.
How does the embryo of an egg-laying animal obtain nutrients for growth?
A. from the calcium carbonate found in the egg shell B. from the yolk of the egg C. from the mother's body D. from the amniotic sac E. through tiny pores in the shell of the egg