Arrange the following excretory organs in the evolutionary order as
per their structural complexity.
1. Flame cells 2. Nephridia
3.Nephron
4. Green glands
A) 1, 2. 4,3
B) 2, 4, 3, 1
C) 4, 2, 3,1
D) 4, 3, 2, 1
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