The movement of fluids, or circulation, evolved around 3.5 billion years ago in single-celled organisms to distribute nutrients and remove waste. Blood, a specialized fluid carrying nutrients and waste, evolved much later, around 1.2 billion years ago in multicellular organisms. It evolved to feed internal cells and carry away waste. As oxygen levels rose and multicellular life emerged, blood evolved to transport oxygen and nutrients to cells.
I’m taking this time to catch up with the paired videos for recent WWB editions, and to restructure the WWB into seasions of 8 weeks: 40 tidbits consisting of 32 1-Minute Hot Topics and 8 quotes. Each week featureing a tidbit in philosophy, science, critical, thinking, and history as well as a weekly quote. Follow the TST YouTube channel to catch all new videos. –Mike
1START: Philosophy >
3Critical Thinking >
4History!
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