Sponges have a that squeezes out waste.
heart
contractile vacuole
nephron
pore

contractile vacuole

Contractile vacuoles are organelles that are responsible for excretion function. They perform osmoregulation which manages wastes, water and other needed materials in the cell. They are found in some prokaryoric organisms like the algae, protists, amoeba and other unicellular organisms. 

1.fossils 2.analogous organs 3.homologous organs