Organisms Categorized as Excavata Are Considered to Be Highly Degenerative

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The Answer is Answers will vary. Excavates are considered a highly degenerate group of parasites because they have lost both mitochondria and Golgi apparatus through degenerative evolution. This evolutionary step has left them with anaerobic metabolism and an absolute dependence on the anaerobic intestinal environment of their host. Why they evolved this way is unknown, but it can be assumed that the loss of these structures and functions was somehow of benefit energetically or environmentally at some point during their evolution.

Organisms Categorized as Excavata Are Considered to Be Highly Degenerative

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