Examples of acoelomates include:
* Flatworms (Platyhelminthes): This group includes planarians, tapeworms, and flukes. They have a flattened body shape that allows for efficient gas exchange and waste removal.
* Rotifers: These microscopic animals are found in freshwater habitats.
* Gastrotrichs: These tiny, worm-like animals are also found in freshwater habitats.
Why is a body cavity important?
A body cavity, or coelom, is a fluid-filled space that provides many advantages for animals, including:
* Support and structure: The coelom acts as a hydrostatic skeleton, allowing the animal to move and change shape.
* Organ protection: The coelom protects internal organs from damage.
* Circulation: The fluid in the coelom helps transport nutrients and waste products.
* Space for organs: The coelom allows for the development of complex organ systems.
While acoelomates lack a coelom, they have evolved other adaptations to survive without one. For example, they have a flattened body shape that allows for efficient gas exchange and waste removal.