Question

2.
is used by all living things.
(a) Nitrogen
(b) Carbondioxide
(C) Ozone​

Answer 1

Answer:

ozone....I think so it question's answer

Answer 2

here's your answer.....

..... according to me...

option A..is the right answer...

as nitrogen is essential for the synthesis of protein....!!

....

... hope it helps you