Why does it take a long time to develop a new variety of tomato?

a.
changes in traits happen gradually, over many generations.

b.
tomatoes cannot acquire new traits.

c.
a species cannot change over time.

d.
many plants resist change.

Dna. we have heard that we are a product of our dna. but where is it? how do we "get" our dna? it is passed to us, from our parents, but in what form? several vocabulary words associated with inheritance are used interchangeably and sometimes, incorrectly. let's see if you can clear this up for someone just learning about inheritance and cell structure.