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Paramecium bursaria under a microscope. All creatures whose cells house a nucleus, including Paramecium bursaria, can be traced back to a common ancestor called the Last Eukaryotic Common Ancestor (LECA).

New single-celled hunters may have been Earth’s very first predators

Ancient organisms that crossed Earth’s waterways at least 1.6 billion years ago don’t seem to have much in common with humans, but we couldn’t have evolved without the eukaryotes called Protosterol. Biota. A team of researchers has discovered a “lost world” of these ancient organisms inside a rock that had formed on the ocean floor […]