In captivity, tigers and lions have been known to interbreed and produce hybrids, known as ligers. Why does this NOT make them the same species, according to the biological species concept?
a) the production of ligers is a pre-zygotic species barrier
b) producing hybrids in captivity is not a form of interbreeding
c) tigers and lions are at the opposite end of a species ring
d) captivity is not a natural condition
e) tigers and lions are, in fact, considered the same species under the biological species concept
Answer: d) captivity is not a natural condition
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