An Important Discovery of Plant Genetics Is That

An important discovery of plant genetics is that

A) in a given species, small genetic differences can lead to large differences in plant form.
B) complexity of structure corresponds to complexity of basic plant components.
C) within plant species there is little variation in form because there is little genetic variation.
D) in a given species , large genetic differences are necessary for large differences in form.
E) large differences in the forms of different species of plants are always caused by large genetic differences.