Abnormalities in the number of X chromosomes tends to have milder phenotypic effects than the same abnormalities in autosomes because of .

Why is planting a wide variety of plant species better than planting only one type? a) diversity is best for the environment. b) a wide variety would mean less wear and tear on the soil. c) it would lead to desertification prevention. d) combining biological and chemical controls are the conditions of a healthy farm.