Which of the following is not a feature that almost all connective tissues have in common?
A. Most connective tissues are highly vascular.
B. Ground substance is so scarce that it is not visible with a light microscope.
C. Protein fibers are usually present in the ground substance.
D. Cells usually occupy less space than the extracellular material.
E. Most cells are not in direct contact with each other.
Answer: B
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Fill in the blank(s) with correct word