Are Sponges Alive? Sponges aren’t just for scrubbing dishes—they’re actually living creatures made up of a cluster of cells. Even without organs or a heart, they’re a fascinating microcosm of life. Their cells are often packed with bacteria, creating a mini world within. By constantly filtering water, sponges form a special bond with bacteria like nitrifiers, giving them the nutrients to thrive. So next time you think of a sponge, remember it’s more than a cleaning tool—it’s a tiny marvel of nat