Which of the following are the layers of the body wall in sponges?
Which of the following are the layers of the body wall in sponges?
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Explanation
The body wall of sponges is composed of two main layers: the pinacoderm and the choanoderm.
The pinacoderm is the outermost layer, made up of flat cells called pinacocytes, which cover the external surface of the sponge.