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Evaluate why we would sill have fish around with primitive features when we have other animals evolved from it. I'm looking for an answer and three evidences to support that answer.. Thanks!!
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Answer #1

The fish which is having primitive features is a storehouse of germplasm and wild type genes which will not be found in the animals evolved from it. Such fish will always remain as a model organism for study and its DNA can be utilized for various researches.

Second, in phylogenetic tree construction, this fish having primitive features, will form the root. Using this fish, the complete tree can be constructed.

Also, if new fish have evolved, it simply means that this fish is surviving in extreme conditions. Any changes in DNA under these extreme conditions can be clearly studied in this fish.

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