Question

(a) Lead, mercury, fluoride and
are greatestthreat to human health.
(i) iron
(ii) cadmium
(iii) calcium
(b) Which of the following is not a possible sourceof manmade radioactive contamination of theatmosphere?
(i) the production of nuclear fuel
(ii) testing of nuclear weapons
(iii) nearness to the aerodromes​

Answer 1

Answer:

a) cadmium

b) Sry,I don't know

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Answer 2

(a) Cadmium
(b) nearness to the aerodromes.

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