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New to this forum! -p-n-e
primitive marine animal

Sponge - welcome to the forum :-)

an additional clue; if these creatures were removed from the water by how much would sea levels rise?

thanks how daft am I?!

Not daft at all, we all have blind spots at different times. Btw - as you see, phillip gave a hint rather than blurting out an answer as I did. If you request one or the other, people usually oblige.

Appreciate the info. Mrs Trellis. Thanks.