Question

Excretory system
3. Complete these sentences.
(a) Kidneys filter waste products from the blood in the form of
(b) Inhaled air is rich in
(c) Exhaled air is full of
(d) Blood vessels carry

to the different parts of the body.
4. Describe the human skeletal system.
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Answer 1

a. Nitrogenous waste

b. Oxygen

c. Carbondioxide

d. Blood