Students measured the temperature of the water at different depths in a pond and found that the temperature varied (was not the same everywhere). Independent variable and dependent variable.

This aquarium exhibits biotic and abiotic factors in an aquatic environment. one of the abiotic factors is

Explain two reasons you think it is important for scientists to search for new ways to treat cancer

Hurry which of these is true about index fossils? a) are very scarcely found b) used as guides in relative dating c) found in the youngest layer of the rock d) used as reference points in absolute dating