Plants on Earth provide food, some even provide shelter to some animals, and plants such as trees provide oxygen to the environment.
I think genetic variation, but i'm not completely sure
Answer:
Explanation:
biology of your talking about life evolution but all if your talking about mankind evolution and technology
Answer:
Option-D, a segment of DNA
Explanation:
A gene represents the particular segment of DNA which contains the instruction for the trait of an organism. The nucleotide sequence present in the segment provides the instruction in the form of codons.
The gene is present in the form of its alternative form called alleles which are located on the chromosomes at locus. The alleles represent the variants of the gene and therefore controls the two variety of a single trait.
Thus, Option-D is correct.
