Discussion
The groups which are evolved from more than one ancestor are known as :
Answer: C
Groups derived from more than one ancestor are polyphyletic.
A polyphyletic group gathers organisms from different ancestral lineages without their common ancestor, usually on a similarity that evolved independently. Grouping birds and bats together as 'flying vertebrates' is an example, since flight arose separately in each.
A monophyletic group (clade) contains one ancestor and all of its descendants. A paraphyletic group has one common ancestor but leaves out some descendants, as 'reptiles' do when birds are excluded. 'Heterophyletic' is not a standard term in systematics.
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