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A LITTLE SOMETHING WORTH KNOWING

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ScienceOne small ahaBiology concept

Preserved remains or traces of ancient life.

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Your new ahaFossil

Fossils preserve remains or traces of ancient life across long geological timescales, like dinosaur bones in rock layers. Source: Fossil ↗

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More from From Cells to Species

A few more worth knowing.

  1. 28A caterpillar becoming a butterfly illustrates this developmental transformation.RECALL
    Metamorphosis

    Metamorphosis transforms an animal's body form during development, most famously a caterpillar becoming a butterfly.

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  2. 29These animals have backbones and include fish, birds, and mammals.RECALL
    Vertebrates

    Vertebrates are animals defined by having a backbone, a group spanning fish, birds, and mammals.

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  3. 30These animals feed their young with milk; most bear live young.RECALL
    Mammals

    Mammals nurse their young with milk, and nearly all give birth to live young rather than laying eggs.

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