In your biology lab, The distinguishing animal trait "A," that separates the body forms of the eumetazoa and then parazoa use a stereoscopic microscope to observe a living animal that uses only one opening to both take in its food and eject its waste products. What is the body arrangement of this animal

The options:

A. incomplete digestive tract

B. gastrovascular cavity

C. complete digestive tract

D. complete digestive tract and a gastrovascular cavity

E. incomplete digestive tract and a gastrovascular cavity

The CORRECT ANSWER IS E.

E. incomplete digestive tract and a gastrovascular cavity

Explanation:

Phylum Cnidaria; Cnidarians are diploblastic with two embryonic germ layers -the ectoderm and the endoderm) with well structured tissue, performs extracellular digestion, and use cnidocytes for defence and to catch prey.

Cnidarians have two unique morphological body plans which are referred to as polyp, its sessile in adults, and medusa are mobile; some species has both body structures in their lifecycle.

It undergo extracellular digestion, where enzymes dissolve the food substances as its cells lining the gastrovascular cavity take in the nutrients.

Cnidarians are known to have a body arrangement of incomplete digestive system with just one opening; the gastrovascular cavity that functions as both a mouth and an anus.

The cnidarians undergo extracellular digestion, the food is moved to the gastrovascular cavity, enzymes are present in the cavity, with the cells lining the cavity taken in nutrients. The gastrovascular cavity possess a singular opening that acts as a mouth and an anus; this is referred to as an incomplete digestive system.

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