The incredible discovery has finally revealed the first animals to grow a skeleton
Before life on Earth exploded in diversity about 540 million years ago, the first skeletons of primitive animals were already beginning to form. Fluffy-looking sea sponges from this time have been found in thimble-like tubular forms, structured by hard, mineralized threads, specimens believed to be among the earliest assemblages of skeletal fossils. However, there are …
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