• Biological concept: a group of populations that can interbreed and produce viable, fertile offspring
• Morphological concept: group of organisms in which individuals conform to certain fixed properties
Which of the following statements regarding the definition of species is false?
A) The ecological species concept identifies species in terms of their ecological niches.
B) The phylogenetic species concept defines a species as a set of organisms that shares a common ancestor and forms one branch on the tree of life.
C) The morphological species concept relies upon comparing the DNA sequences of organisms.
D) Under the biological species concept, the gap between species is maintained by reproductive isolation.
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