A mixture , the different parts of which vary in composition and properties​

What problem would a person have if the nucleic acid in one of his or her cells were damaged?

Layers of rock containing fossils, like the layers illustrated here, are most likely composed of rocks.

Some liquids can be distilled, but only at temperatures that are so high that it is impractical, or so high the compound decomposes. explain why distillation such compounds at significantly less than atmospheric pressure (some degree of vacuum) would solve this problem.