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Segment 1: (6 min.) Life Cycles - All organisms undergo cycles of life. Learn about the life cycles of several animals, including reproduction. Segment 2: (5 min.) Heredity - Learn about genes and heredity and discover the genetic connection between modern birds and ancient dinosaurs. Segment 3: (6 min.) Behavior: Explore the concept of behavior and see what kinds of instinctual behaviors some animals possess. Segment 4: (6 min.) Cell Structure - A mature human has an estimated 100 trillion cells, all of which work together. Take a close look at the structure and function of cells.