Sentences with phrase «early multicellular creatures»
The idea is that as they dug and wiggled, these early multicellular creatures — some were likely worms as long as 40 cm — exposed new layers of seafloor sediment to the ocean's water.
http://www.sciencemag.org/ Not exact matches
Although the oldest animal fossils date back 544 million years, most evolutionists agree that complex, multicellular creatures probably appeared at least 150 million years earlier than that.