A substance such as a fat, a protein, or a carbohydrate that a living thing needs to survive.

Carrots
Nutrients
Mineral
Saliva

Will someone me with this.. specialized cells which perform a particular function form: tissues organs or organism

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

When an object is moving away from you while still making a sound, the pitch of the sound is perceived to a. lower b. unchanged c. fluctuating d.higher