Pregnancy is most likely to occur in a woman with a 28-day cycle if sexual intercourse occurs on day ____.
A. 5
B. 10
C. 15
D. 20
Answer: C. 15
Biology & Microbiology
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What drives the flow of water through the xylem?
A) passive transport by the endodermis B) the number of companion cells in the phloem C) the evaporation of water from the leaves D) active transport by sieve-tube elements E) active transport by tracheid and vessel elements
Biology & Microbiology
The overall charge of a water molecule is ________
a. slightly negative b. slightly positive c. neutral d. a full negative charge
Biology & Microbiology
Which of these diseases does not belong with the others?
A) Yersinia pestis B) Measles C) Brucella D) Hantavirus
Biology & Microbiology
__________ such as reptiles control core temperature mainly by behavior.
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology