Give a full detailed answer to the question. Prove on the example of parasitic tapeworms that general degeneration is one of the ways

Give a full detailed answer to the question. Prove on the example of parasitic tapeworms that general degeneration is one of the ways to achieve biological progress.

1) Degeneration is a way to achieve biological progress in parasitic tapeworms, because their number is increasing.
2) Increases adaptation to environmental conditions.
3) There is an expansion of the range.
4) Increases fertility.

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