Instructions

In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.

Nitrogen is essential to life (1)______ Earth. It is a component of all proteins, and it can be (2)______ in all living systems. Nitrogen compounds are (3)______ in organic materials, foods, fertilisers, explosives and poisons. Nitrogen is crucial to life, (4)______ in excess it can also be (5)______ to the environment.

Question 21

Select the most appropriate option to fill in blank no. 1.


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