MCQ
The first chemicals formed on the earth were ………………. etc.
  • A
    oxygen, CFC, ozone
  • B
    DNA. RNA and nucleotides
  • C
    salt, sugar, proteins
  • water, ammonia, methane

Answer

Correct option: D.
water, ammonia, methane
water, ammonia, methane

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free