Natural Science homework for Tuesday

4ºA

Answer these questions:
1. Explain the excretory system.
2. Which are the organs of the digestive system.
3. When does the reproduction begin?
4. How many months does a human pregnancy last?
5. Which are the organs of the male reproductive system?
6. Write the bones that we can find in our arm.
7. What does the nervous system do? Which are the five senses? And their organs?


4ºB

Answer these questions:
1. What is the main organ in the circulatory system?
2. What carries nutrients and oxygen through our body?
3. How does the body expel the different types of waste?
4. What is the urine? And the waste?
5. Why are alveoli so important?
6. What's the anus?
7. What would happen if you ate without smelling?
8. Why is the skeleton so important?

9. What is a joint?

10. How many types of muscles are there?