Question

Biodegradable wastes usually do not pollute the environment. They are considered a threat only when -
i) They are present in small amounts.
ii) Their amount is large.
iii) They cannot be degraded in nature at right time.
iv) Both (ii) and (iii).

Answer 1

Answer:

4 both second and three

Explanation:

Answer 2

iv) both (ii) and (iii)