There is no such thing as a pine tree.the needles found on a pine tree as serving the same purpose called photosynthesis
"Pine" is a description of a bunch of different trees, bushes and other plants which have green needles.
According to your belief, none of these plants share anything in common.
Yet, if we were to make the genes of each plant, we could accurately draw up a map showing which plants were more closely related to which.
If NONE of these trees/plants are related to one another, why do they have genes in common?