1. Blood enters into right atrium through

2. Circulation of blood takes place in unicellular organisms through the

3. Types of closes circulatory system

4. systemic means circulation in

5. How many types of circulatory system

6. Oxygenated blood is present in

7. How respiratory system takes place in fish

8. Movement of substances from higher concentration to lower is called

9. Fish is an example of

10. In Fishes' heart ventricle pumps blood into

11. Circulatory system transports through which thing

12. Which one is example of open circulatory system

13. The heart consists of

14. In animals transport of gases nutrients is called

15. The largest artery which supplies blood towards the body is called

16. Pulmonary means circulations in

17. Which type of circulation in vertebrates

18. in close circulatory system blood is enclosed with in

19. Circulatory system transports through which thing

20. Close circulatory system is More efficient and complicated as compare of