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Author Question: Excretory structures known as protonephridia are present in A) flatworms. B) ear (Read 671 times)

j_sun

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on: Sep 17, 2013
Excretory structures known as protonephridia are present in
A) flatworms.
B) earthworms.
C) insects.
D) vertebrates.
E) cnidarians.


sammy

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Reply #1 on: Sep 21, 2013
I remember it was A


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j_sun

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Reply #2 on: Oct 15, 2013
Thanks dude! Marking this solved.


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