Q52 of 290 Page 169

People who die from AIDS are not killed by the virus itself. Explain.

AIDS virus damages the immune system of the body rendering the body weak and prone to infections. Thus, virus does not kill the humans directly.


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50

Why is it an advantage for the testes to be situated in the scrotal sac outside the main body cavity ? Can you think of one disadvantage ?

 51

Which structures in human female are equivalent to the following structures in the male?

(a) testes


(b) vas deferens


(c) penis


In each case say in what respect the structures are equivalent ?

 53

What is the life support system of a fetus?

 53

How long does a human baby take to develop before birth?