The smallest group of organisms in which evolution can take place is Species.
Dry air might be the answer but honestly I’m not sure if it is
The correct answer is (A) Chromosomes.
The color of the horse coat is determined by chromosomes. The genes present on the chromosomes is responsible for the coat color of horse. The dominant coat color of the horse is transferred to the horse from its parents. This is inherited pattern and the coat color can be black, white, brown, etc.
The difference is because there about different from one another, the reflexes will act different towards the speed