Which of the following does NOT characterize tundra?
A. shrub
B. trees
C. permafrost
D. caribou
Answer: B
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Consider the following two statements about structural representations of molecules:
1) In a ring structure, an unlabeled atom at the angle where two lines join is assumed to be a carbon. 2) Unlabeled atoms joined to carbons, which are not directly part of a ring structure, are assumed to be oxygens. Determine which one of the statements below is correct. A. Statements 1) and 2) are both true. B. Statements 1) and 2) are both false. C. Statement 1) is true; statement 2) is false. D. Statement 1) is false; statement 2) is true.
Among animals, oviparity can be found in (select all correct choices):
A. birds. B. reptiles. C. mammals. D. amphibians. E. insects.
A(n) ________ organism is generally harmless in its normal host but can become pathogenic in a compromised host.
Fill in the blank(s) with the appropriate word(s).
A woman can best predict the time of an upcoming ovulation by testing each day for ______.
A. luteinizing hormone B. follicle-stimulating hormone C. estrogen D. progesterone