Adipose tissue cells are filled with
a. minerals.
b. fat.
c. cartilage.
d. fibers.
e. muscles.
B
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Define the terms herbivore, carnivore, and omnivore.
What will be an ideal response?
What type of life cycle is observed in plants and some algae?
a. alteration of generations b. alteration of species c. gametophyte and sporophyte generations d. zygotic life cycle e. gametic life cycle
In Figure 23-2, the X points to a
a) guard cell. b) mesophyll cell. c) vein. d) stoma.
One of the reasons study of nitrogen use in plants is of special interest is because
A. nitrogen in its atmospheric form is not useable by plants. B. nitrogen is limited in our atmosphere. C. nitrogen is not an essential element for plant growth. D. none of the forms of nitrogen is easily absorbed by plants. E. nitrogen is often toxic to plants.