Why do apples taste good?

No need to be condescending Taz....TaylorA while ago I hiking on a trail here in North Idaho. I came across a pile of horse crap and growing out of the pile of horse crap was a fine healthy crop of Spotted Knapweed, an invasive noxious weed that is foreign to the area. I wish I had a camera since a picture would have been worth a thousand words. That in a nut shell is the reason behind edible fruits and seeds - dispersion.An interesting side point on this topic, is that I recently read an article, highlighting the fact that Avocado fruit was poisonous and undesirable to birds.Some have theorized that avocado's had originally adapted to a symbiotic relationship with now extinct large mammals such the giant ground sloth. These giant mammals could swallow and pass the massive pits and disperse the seeds far and wide. However, since the seeds were large, bird eating the fruit were largely destructive, so Avocado evolved chemicals that were harmless to sloths but toxic to birds.