Bone cells communicate with one another by:
a. Haversian canals.
b. cellular extensions running through canaliculi.
c. lymphatic vessels.
d. diffusion through the matrix.
e. lamellae.
B
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The first cells probably arose about
A. 500 million years ago. B. 1.2 billion years ago. C. two billion years ago. D. six billion years ago. E. four billion years ago.
Under which circumstance would electrons be most likely to be shared equally?
A) when they are equidistant from nuclei B) when atoms of the same element are shaking them C) when they are equidistant from each other D) when the atoms sharing them are different
During which phase do daughter nuclei reappear?
metaphase interphase telophase prophase anaphase
An iceberg near the Arctic Circle represents which unusual property of water?
A) Its high specific heat B) Its higher density as a liquid than as a solid C) Its heat of vaporization D) Its effectiveness as a solvent