You observe two atoms of the same element that contain the same number of protons and electrons but different numbers of neutrons. These two atoms would best be described as being ________________ of each other.

The subcutaneous layer under the skin is composed of __________________ and ___________________ tissue.

Atoms that are stable

___________________ is described as the least malignant but most common type of skin cancer.

In living organisms, the ________________ level or organization is considered to be the lowest level of organization.

Sodium chloride is an example of 

The lowest level of biological organization that can metabolize, have growth and development, have homeostasis, and the rest of the properties of life is the

In connective tissue, ___________________ fibers are very thin, highly branced and they form networks for support.

Phospholipids, fats and oils are all classified as lipids because they all are:

The ears and nose are primarily composed of ____________________.