• Question: How are organmism developed even if over time, how could bone, marrow, cells, fluids, receptors, skin all form together to make humans and to make a fully-functioning human body that knew how to work itself mate, talk adapt and reproduce.

    Asked by anon-240740 to Tom, Rebecca, Emily, Elspeth, Ben, Antoine on 10 Mar 2020.
    • Photo: Antoine Bourget

      Antoine Bourget answered on 10 Mar 2020:

      You can basically “see” this evolution in organisms still living today. Our ancestors from 10 million years ago looked like chimps look like now; 100 millions years ago like mice look like now; 1 billion years ago like bacteria look like now. We know pretty well all the steps in this evolution, and the key point is that the various elements that constitute us now appeared progressively.
      Cells came first, with primitive receptors, then some kind of skin, then bones, etc. All this process was driven by natural selection.

    • Photo: Tom Dally

      Tom Dally answered on 10 Mar 2020: last edited 10 Mar 2020 6:13 pm

      The simple answer is evolution 🙂 life has been evolving on Earth for nearly 4 billion years. During that time, simple, single-celled organisms have adapted and evolved to form the massive variety of life that we have now (plus all of the species that have ever existed, like the dinosaurs), and we share a common ancestry (somewhere in the tree of life) with every one of those species. And, as Antoine said, it’s because of natural selection. Different environmental pressures, like climate, predation, and disease, all act on species, which must adapt to survive. We are the way we are because our ancestors adapted and survived (and we still are).

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