Discussion
A clade is a set of species :
Answer: A
A clade is a set of species derived from a common ancestor.
In cladistics a clade, or monophyletic group, consists of a single ancestor and all of its descendants; it is one complete branch of the tree of life. Birds, for example, form a clade within the dinosaurs.
A group derived from two or several unrelated ancestors would be polyphyletic, which cladistics rejects as a natural grouping. Species sharing a particular environment form an ecological group, not a clade.
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