During the snowball earth temperatures at the equator rarely exceeded -20 degrees Celsius. Why didn't heat from the sun melt the ice?
A. The high levels of atmospheric moisture created extensive cloud cover.
B. Ice reflected most of radiant energy.
C. The ozone layer absorbed all the heat.
D. The earth's core was cooled and kept the ice frozen.
B. Ice reflected most of radiant energy.
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In cell communication, which one of the following is a requirement of the responding cell?
A. It must be a eukaryotic cell. B. It must produce signaling molecules. C. It must have receptor proteins. D. It must be a prokaryotic cell.
Polar covalent bonds:
A. can result in molecules having an electric dipole moment. B. can result in molecules having separated positive and negative charges. C. will not be present in nonpolar molecules. D. occur when the electrons in the bond are shared between the atoms but biased toward one atom in the bond. E. All of these choices are correct.
Functions of joints
What will be an ideal response?
community
What will be an ideal response?