(c) State and explain the wo the three agents of pollution.
á Distinguish between external and internal fertilization and give two examples of each,
7. Explain why? (a) it is possible for a person to swallow something while standing on his head
(b) one does not urinate frequently on a hot day
8. Briefly explain how the following illustrates osmosis:-
(a) Busting of red blood cell when immersed in dilute solution
(b)Shrinking of a cell when immersed in a high concentrated solution
Explain why fish dies when taken out of water to land while frog survive in other water and land?
10. What are the risky situations, behaviors and practice of STI, STD, HIV and AIDS diseases