Scientists have solved a 500 million year old mystery about strange Cambrian structures discovered in China
More than 500 million years ago, marine invertebrates launched a new evolutionary experiment: skeletons. But while these durable, tube-like structures have stood the test of time as fossils, the animals’ soft bodies have decayed and disappeared, erasing any trace of what these ancient animals might have looked like. Now, a recent re-examination of these ancient …