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A LITTLE SOMETHING WORTH KNOWING

A small discovery. Yours to pass on.

ScienceOne small ahaBiology concept

These energy-converting organelles are thought to descend from once free-living bacteria.

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ScienceOne small aha
Your new ahaMitochondria

Mitochondria help cells make ATP through cellular respiration. Source: Mitochondrion ↗

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More from From Cells to Species

A few more worth knowing.

  1. 04This process changes trait frequencies when inherited differences affect survival and reproduction.RECALL
    Natural Selection

    Natural selection favors helpful traits over generations, illustrated by peppered moths shifting color amid industrial pollution.

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  2. 05This term describes change in populations' inherited characteristics over generations.RECALL
    Evolution

    Evolution describes gradual change across generations, driven largely by natural selection acting on genetic variation.

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  3. 06Under the biological definition, members of this group can interbreed and produce fertile offspring.RECALL
    Species

    A species is generally defined by the ability of its members to interbreed and produce fertile offspring.

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