What is the smallest possible piece of an element?
a. atom
b. mixture
c. molecule
d. compound

organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.