Question

A _________ is an organism whose body cavity forms between the body wall and the digestive system.

Answer 1

A eucoelomate is an organism with a body cavity, called a coelom, which lies between the body wall and the digestive system and is completely lined with mesodermal tissue. This coelom houses major organs and provides cushioning, organ protection, and facilitates organ growth and nutrient diffusion.

Step-by-step explanation:

A eucoelomate is an organism whose body cavity forms between the body wall and the digestive system. Animals with three germ layers, also known as triploblasts, may develop this internal body cavity derived from mesoderm, called a coelom. This fluid-filled cavity is completely enclosed by mesodermal tissue. Animals that possess such a coelom can have more complex organ systems and provide better protection for internal structures through fluid cushioning. For instance, in humans, the body cavity is divided into the thoracic cavity, which houses the heart and lungs, and the abdominopelvic cavity, home to the kidneys, digestive, and reproductive organs.

Body cavities are an important aspect in the evolution and classification of animals, particularly within the Bilateria group. The coelom has various advantages, including cushioning internal organs, providing space for organ movement and growth, and facilitating the diffusion of gases and nutrients. Some examples of eucoelomates are mollusks and annelids, which display this advanced body cavity structure.

Answer 2

Hope this help

Coelom is a fluid filled space between the body wall and digestive tract. The presence or absence of body cavity or coelom plays a very important role in the classification of animals. Animals that possess a fluid filled cavity between body wall and digestive tract are known as coelomates.