4.+The+continuity+of+life+is+sustained+through+reproduction+and+development.

MAJOR UNDERSTANDINGS 4.1a Plants and animals have life cycles. 4.1b Each kind of plant goes through its own stages of growth and development that may include seed, young plant, and mature plant. 4.1c The length of time from beginning of development to death of the plant is called its life span. 4.1dLife cycles of some plants include changes from seed to mature plant. 4.1e Each generation of animals goes through changes in form from young to adult.  4.1f Each kind of animal goes through its own stages of growth and development during its life span. 4.1g The length of time from an animal's birth to its death is called its life span. Life spans of different animals vary. 4.2a Growth is the process by which plants and animals increase in size.

4.2b Food supplies the energy and materials necessary for growth and repair .