Answer:
A
Explanation:
The correct option is (a). Chromosomes are long thread-like structures present in the nucleus of a cell which contains hereditary information of the cell (genes). Genes are the part of a chromosome and made up of DNA.
chromosomes contain genes and Gene's are made of dna.
Atmosphere.
Hydrosphere.
Biosphere.
Cryosphere.
Lithosphere(also referred to as the Geosphere).
I'd use the library, the encyclopedia and the Internet.
D the last one
