Seven hundred million years ago, a remarkable creature emerged for the first time. Though it may not have been much to look at by today's standards, the animal had a front and a back, a top and a ...
700 million years ago, a remarkable creature emerged for the first time. Though it may not have been much to look at by today’s standards, the animal had a front and a back, a top and a bottom. This ...
A study suggests a key role for gene copy number changes in polar bear evolution. Polar bears and brown bears occupy distinct ecologies, despite having diverged comparatively recently--less than ...
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