6. name the ancestor of the following:
broccoli, kohlrabi, kale​

i think there ancestor is wild cabbage .
      i hope it helps^_^

The answer is wild cabbage!

Wild cabbage is the ancestor

wild cabbage is the ancestor of broccoli ,kohlrabi and kale.it is by means of natural selection where each of them is obtained by changing the gene pattern of wild cabbage.

Wild cabbage

Explanation:

The Brassica oleracea is the scientific name of the wild cabbage. The family of wild cabbage includes the varieties of cabbage like cauliflower, kohlrabi, broccoli, kale, collards and others.The wild cabbage was the ancestor of all these varieties and was chosen for artificial selection because of the flowering buds, edible stems and large leaves. The artificial selection is a process by which the humans select the particular features in the living beings for breeding to obtain the desire traits.The artificial selection has helped to develop many varieties of cabbage from common wild cabbage species by using selective breeding procedure.

Learn more about cabbage:

Cabbage is avegetable​: