A rare chemical indicator suggests sponges may have arrived as the first animals on Earth. A sterol core is primarily composed of four fused carbon rings, along with carbon side chains and other ...
Freshwater sponge washed up at Long Pond Iron Works.jpg Freshwater sponge washed up on shore at Long Pond Iron Works State Park. (Photo by John Parke) While having a slow day of bird watching with a ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results