Sponges are among Earth's most ancient animals, but exactly when they evolved has long puzzled scientists. Genetic ...

The fossils are more than 350 million years older than the next-oldest sponge fossils. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. That sea ...

Sponges are among earth’s most ancient animals, but exactly when they evolved has long puzzled scientists. Genetic ...

Molecular clocks, which use the mutation rate of biomolecules to deduce how long ago two species diverged, and phylogenetics (the evolutionary relationships between species) can tell us when sea ...