These animals have evolved various mechanisms to survive without a traditional heart, often relying on their unique body structures.
1
Jellyfish are simple marine animals that lack a centralized heart. Instead, they have a diffuse network of cells and a gelatinous body.
2
Sponges are primitive aquatic animals that don't have a heart or a circulatory system, they rely on the movement of water.
3
Flatworms, such as planarians, don't possess a heart. Their flat, thin bodies allow for direct diffusion of gases.
4
This group includes corals and sea anemones. Like jellyfish, they lack a heart and rely on a simple gastrovascular cavity.
5
While sea cucumbers have a simple tube-like body structure, they don't have a heart. they rely on their coelomic fluid.
6
Nematodes do not have a heart, their pseudocolour helps to transport nutrient.
7
A small, fresh-water organism related to jellyfish and corals, hydras have no heart.