Nectarines are not a product of cross pollination. They are peaches that do not have fuzz. Some peach seeds produce trees that bear fruit that is not fuzzy. Sometimes a peach tree will bear both nectarines and peaches. Growers commonly graft branches from nectarine trees onto peach trees in order to produce nectarines.
where were nectarines originated
No, nectarines are peaches that have a recessive inactive version of the gene that produces peachfuzz.
yes
Yes nectarines can be canned. You may leave them whole or sliced. Boil in a syrup or water bath and can them.
Yes
anyone can.
nectarines
yes
Cherries do. So do nectarines.
Citric Acid.
yes
My cat eats nectarines all the time - he's never had a problem! My kitty pretty much wants to eat or at least try to eat what ever it is that I'm eating. I think he prefers cantaloupe and nectarines because they tend to be more juicy.