Discussion Forum

Nutritionists declare that the mineral selenium, despite its toxic aspects, is_______________to life, even though it is needed in extremely small quantities.

Answer:

Explanation:

(C) Something which is needed for life, even if it is in extremely small quantities, cannot be described as destructive to life, or insignificant to life, or extraneous to life. It can only be described as being essential to life. So (C) is the answer.