Concept:Plant breeding aims to improve crop traits, but it does not focus on changing natural pollination systems.
Explanation:Plant breeders work to develop crops with desirable traits.
These traits include tolerance to climate extremes, resistance to pests, and uniformity in time of maturity.
However, adaptation to pollination is not a breeding objective.
Pollination is a natural biological process that plants already perform.
Breeders do not aim to alter or adapt pollination itself.
Therefore, the trait that is not an aim of plant breeders is adaptation to pollination.
Answer:A. adaptation to pollination