The physical aspects of an ecosystem, or its include soil, water, and weather

How do you date a sample of rock that you suspect as being one of the earliest on earth

Why do we perceive objects as retaining their brightness under different lighting levels?

Why do some dna fragments move farther than others during gel electrophoresis? a. because their shapes are different b. because they are different types of molecules c. because the samples are different colors d. because their masses are different