* Organisms with circulatory systems:
* Animals: Most animals, including vertebrates (humans, fish, birds, etc.) and many invertebrates (earthworms, insects, etc.), have circulatory systems. These systems transport oxygen, nutrients, and waste products throughout the body.
* Organisms without circulatory systems:
* Plants: Plants use diffusion and specialized vascular tissue (xylem and phloem) to move substances around. They do not have a traditional circulatory system like animals.
* Simple multicellular organisms: Some simple multicellular organisms, like sponges, do not have a circulatory system. They rely on diffusion for the movement of substances.
In summary: While a circulatory system is common in animals, it is not a universal feature of all multicellular organisms.
