Which of these groups does not fit well into the biological species concept?

Name: Which of these groups does not fit well into the biological species concept?
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Question

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The biological species concept defines a species as a group of organisms that can interbreed and produce viable offspring. This concept doesn't apply well to protists as many protists reproduce asexually or have complex reproductive systems that make it difficult to determine if they can interbreed with other organisms.

Which of These Groups Does Not Fit Well into the Biological