Mesoglea occurs betweenA. Ectoderm and endodermB. Ectoderm and mesodermC. Mesoderm and endodermD. Just below mesoderm

The correct answer is B. Ectoderm and mesoderm.

Explanation:
Mesoglea is a jelly-like substance found between two layers of cells in certain animals. It is present in organisms such as cnidarians (e.g., jellyfish) and ctenophores (e.g., comb jellies). The layers involved in these organisms are:

Ectoderm – the outer layer.
Mesoderm – the middle layer in organisms that have this structure (mesoderm is typically found in triploblastic animals).
Mesoglea lies between the ectoderm and mesoderm, serving as a non-cellular layer that provides structural support, buoyancy, and contributes to the animal's shape. It is not a true tissue but rather a gelatinous matrix.

Therefore, the correct option is B. Ectoderm and mesoderm.