Question

In which phylum the first excreatory organs are evolved? ​

Answer 1

Explanation:

The earliest fossil vertebrates are found in marine deposits, but the fossil record shows clearly that the early evolution of fishes took place in ..

This is not to say, however, that each invertebrate phylum has evolved its own particular type of excretory organ; rather, there appear to be ...

Answer 2

Answer:

Flame Cells of Planaria and Nephridia of Worms As multi-cellular systems evolved to have organ systems that divided the metabolic needs of the body, individual organs evolved to perform the excretory function. Planaria are flatworms that live in fresh water.