Three germ layer and Mesoderm lines space called

The correct answer is Coelom

Explanation:

• During the embryonic development of triploblastic animals, three primary germ layers are formed: the ectoderm, mesoderm, and endoderm.
• The coelom is a fluid-filled cavity that lies within the mesoderm and is lined by mesodermal tissue.
• This cavity allows for the development and expansion of internal organs and provides a space for them to move independently of the body wall.

Fig: Diagrammatic sectional view of (a) Coelomate (b) Pseudocoelomate (c) Acoelomate

Other Options:

• Pseudocoelom: A pseudocoelom is a body cavity that is not fully lined by mesodermal tissue. Instead, it is partially lined by tissue derived from the mesoderm and endoderm. This type of body cavity is found in pseudocoelomate animals, such as roundworms (Nematoda). It does not provide as much structural support or organ development potential as a true coelom.
• Acoelom: Acoelomate animals lack a body cavity altogether. Their internal organs are embedded directly within solid mesodermal tissue. This condition is seen in simpler animals such as flatworms (Platyhelminthes). The absence of a coelom limits the complexity and size of these organisms.