Question

why is the coelom absent in diploblastic organisms? ​

Answer 1

$\huge\mathfrak\purple{Hello\:Mate}$❤

In diploblastic animals, only the ectoderm and endoderm are present.The true body cavity or coelom originates from the mesoderm and since this layer is absent in diploblastic animals, they lack coelom.

Answer 2

the true body cavity from the mesoderm this layer is absent in diploblastic oraganisms.

hope it helps...

please comment.