Chemicals that regulate pH by taking up and releasing H ions.

All living things react to biotic stimuli but very few react to abiotic stimuli.

Choose the correct order of classification from broadest to most specific?

The study of body form and structure.

What does a person need to do to maintain a license?

To complete their outer shell, atoms may ____ electrons.

Which carbohydrate stores energy in the liver and muscles of animals?

Which best describes an ecosystem?

The pH scale ranges from 1 to 16.

Hydrogen bonding allows 1 water molecule to bond to as many as __ other water molecules.