Life began on Earth more than 3.5 billion years ago, but the history of humans and other vertebrates accounts for only a fraction of this timescale. Chordates (a group that includes vertebrates) and ...
Most sand dollar larvae metamorphosed within 7 weeks, but 6 of 170 (3.5%) formed a hollow bud near the future juvenile mouth (results not shown). Once separated, the evenly ciliated buds developed ...
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