The bulk of a leaf consists of mesophyll, which is photosynthetic ____ with air spaces between cells
a. collenchyma
b. parenchyma
c. sclerenchyma
d. phloem
e. xylem
b
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Which mechanism is used to encourage the movement of water over gills?
a. beating of cilia b. contraction of the diaphragm c. relaxation of a muscular mantle d. a fish swimming with its mouth closed e. relaxation of body muscles
What are the benefits and costs to animals that excrete uric acid?
What will be an ideal response?
The M-phase checkpoint ensures that all chromosomes are attached to the mitotic spindle. If this does not happen, cells would most likely be arrested in _____
A) telophase B) prophase C) prometaphase D) metaphase
If you examined a cross section of a woody stem under the microscope and located the vascular cambium, the tissues on the inside of the vascular cambium ring (toward the center of the stem) would be
A. phloem (primary and secondary). B. xylem (primary and secondary). C. xylem (only primary). D. phelloderm. E. phloem (only secondary).