I WONDER - What Are Jellyfish Made Of? Me Pregunto - De Qué Están Hechas Las Medusas?

Jellyfish are fascinating marine creatures composed mostly of water. Despite lacking a brain or heart, they have a simple nervous system that allows them to function. They do not require a circulatory system as they lack blood, and their thin skin enables them to absorb oxygen directly from the water, eliminating the need for lungs.

What type of creatures are jellyfish described as?

How do jellyfish absorb oxygen?