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True coelom is the space lying between t...

True coelom is the space lying between the alimentary canal and body wall enclosed by the layers of

A

ectoderm on both sides

B

endoderm on one side and ectoderm on the other

C

mesoderm on one side and ectoderm on the other

D

mesoderm on both sides

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**Step-by-Step Solution:** 1. **Understanding True Coelom**: True coelom is defined as the body cavity that exists between the alimentary canal (digestive tract) and the body wall. It is a significant feature in the classification of animals. 2. **Identifying the Layers**: The true coelom is specifically lined by mesodermal tissue. The mesoderm is one of the three primary germ layers in the embryo, the others being ectoderm and endoderm. 3. **Visual Representation**: In diagrams representing true coelom, you can see the coelomic cavity situated between the body wall and the digestive tract, with mesodermal layers lining both sides of the coelom. 4. **Examples of Coelomates**: Animals that possess a true coelom are referred to as coelomates. Examples include arthropods (like insects and crustaceans), mollusks (like snails and clams), echinoderms (like starfish), hemichordates, and chordates (like mammals). 5. **Conclusion**: Therefore, the correct answer to the question is that the true coelom is enclosed by layers of mesoderm. **Final Answer**: True coelom is the space lying between the alimentary canal and body wall enclosed by layers of **mesoderm**. ---
**Step-by-Step Solution:** 1. **Understanding True Coelom**: True coelom is defined as the body cavity that exists between the alimentary canal (digestive tract) and the body wall. It is a significant feature in the classification of animals. 2. **Identifying the Layers**: The true coelom is specifically lined by mesodermal tissue. The mesoderm is one of the three primary germ layers in the embryo, the others being ectoderm and endoderm. 3. **Visual Representation**: In diagrams representing true coelom, you can see the coelomic cavity situated between the body wall and the digestive tract, with mesodermal layers lining both sides of the coelom. ...
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