. Stratification refers to the extended exposure to ________________ that is required for some seeds to germinate.
A. long wavelengths of light
B. low temperatures
C. high relative humidity
D. short daylengths
E. clay soil particles
B. low temperatures
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Water that moves through nonliving regions of root, such as air spaces in root tissue, is following the
a. symplastic pathway. b. transmembrane and symplastic pathways. c. transmembrane pathway. d. apoplastic, transmembrane, and symplastic pathways. e. apoplastic pathway.
Which of the following is an internal defense in the body’s innate immune system?
a. Antibodies b. B cells c. Memory response d. Natural killer cells
A ______carrier continues to be infectious during the recovery period
Fill in the blank(s) with the appropriate word(s).
Bone remodeling not only replaces old bone, but it also
a. maintains homeostasis of the blood level of calcium. b. leads to osteoporosis. c. decreases blood calcium levels. d. causes activation of phagocytic white blood cells. e. causes complete reshaping of bones.