Sponges are the simplest and most primitive animals on earth. They are found in continental water bodies, where 98% of the population are found in salt-water and the remainder in fresh-water.
They have little or no defined organs and movement is hardly noticed in adult sponges, feed by filtration, and have a rather flexible skeletal structure.
At the surface of Venus; the atmospheric pressure is about 70 times that of the Earth’s. This is the pressure of about a kilometer deep into the ocean.
