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Structures in organisms (when no longer adequate for their original purpose) often become secondarily adapted for...

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Biology

Structures in organisms (when no longer adequate for theiroriginal purpose) often become secondarily adapted for a differentuse. In the course of their evolutionary history, vertebrates haveutilized three different \"urinary\" systems. Today, however, we onlyuse one. What has happened to the other two? Why were they nolonger adequate for mammalian needs? What do you think would happento such vestigial structures if a secondary \"use\" did not arise?Why?

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4.2 Ratings (770 Votes)
The vertebrate urinary system has undergone very rapid and discrete changes during the evolution Based upon the ambient environmental conditions the urinary system developed three types of kidneys or nephrons as discussed below 1 Pronephrons These are    See Answer
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