These are the questions: 1. Cells form tissues and organs, which form into complex systems. What are two organs of the digestive system? 2. The maturing of a tadpole into a frog and the changing of a caterpillar into a moth are both forms of a special pattern of development. What is this pattern of development called? 3. What evidence do we have that species have changed over time? 4. Compare and Contrast carnivores and omnivores. Name one way they are similar and one way they are different. 5. Food is a source of nutrients for some organisms. Why do all life forms need nutrients? Give at least two reasons. 6. Describe the difference between a food chain and a food web.