The distinction between the Porifera and Eumetazoa (the true animals) is based mainly on the absence versus the presence of true tissues a complete digestive tract body cavities a blood vascular system
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Eumetazoa, on the other hand, are more complex animals with true tissues and organs. The main distinction between these two groups is based on the presence or absence of true tissues. Show more…
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\begin{equation} \begin{array}{l}{\text { The distinction between sponges and other }} \\ {\text { animal phyla is based mainly on the absence versus the }} \\ {\text { presence of }} \\ {\text { (A) a body cavity. }} \\ {\text { (B) a complete digestive tract. }} \\ {\text { (C) mesoderm. }} \\ {\text { (D) tissues. }}\end{array} \end{equation}
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