If continuing analyses confirm that ctenophores are the sister group to sponges

Question

If continuing analyses confirm that ctenophores are the sister group to sponges plus eumatazoans, which of the following conclusions would be supported? Select all that apply. A) nervous systems evolved convergently in ctenophores and eumetazoans B) flow through guts evolved convergently in eumetazoans C) nematocysts evolved convergently in ctenophores and eumetazoans D) sexual reproduction evolved convergently in ctenophores and eumetazoans If continuing analyses confirm that ctenophores are the sister group to sponges plus eumatazoans, which of the following conclusions would be supported? Select all that apply. A) nervous systems evolved convergently in ctenophores and eumetazoans B) flow through guts evolved convergently in eumetazoans C) nematocysts evolved convergently in ctenophores and eumetazoans D) sexual reproduction evolved convergently in ctenophores and eumetazoans A) nervous systems evolved convergently in ctenophores and eumetazoans B) flow through guts evolved convergently in eumetazoans C) nematocysts evolved convergently in ctenophores and eumetazoans D) sexual reproduction evolved convergently in ctenophores and eumetazoans

Explanation / Answer

A) The nervous system evolved convergently in ctenophores and eumetazoans.

Ctenophores, or comb jellies, represent an example of extensive parallel evolution in neural systems. Electrical signaling in ctenophores is well developed, especially in non-neuronal conductive and locomotory systems. Ctenophores have more genes encoding ion channels than sponges and placozoans.

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