3.+Individual+organisms+and+species+change+over+time.

MAJOR UNDERSTANDINGS

3.1a Each animal has different structures that serve different functions in growth, survival, and reproduction. 3.1b Each plant has different structures that serve different functions in growth, survival, and reproduction.

3.1c In order to survive in their environment, plants and animals must be adapted to that environment.

3.2a Individuals within a species may compete with each other for food, mates, space, water, and shelter in their environment. 3.2b All individuals have variations, and because of these variations, individuals of a species may have an advantage in surviving and reproducing.