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📘 A living body is never still

A body persists while its materials move. How can life do that?

2
lessons
~10 min
to learn
Adults
level
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What you’ll learn

  1. Matter, life, and correspondenceExplain Spencer's relational definition of life and connect it to the volume's treatment of matter, metabolism, and environment.Life appears here as organized activity maintained through continuous material exchange and adjustment to circumstances.
  2. Development, heredity, and evolutionDistinguish Spencer's historical ideas about growth, heredity, and selection from modern biological explanations.Development changes organization, heredity carries variation, and evolution requires keeping those explanatory roles distinct.

Questions this course answers

What is Spencer's central definition of life?

Spencer defines life relationally, as ongoing adjustment between an organism's internal activity and its surroundings.

What does metabolism show in Spencer's account?

Metabolism makes stability an active process of intake, transformation, use, and waste.

Why should Spencer's physiological units not be taught as modern genetics?

Spencer's units were speculative; modern genetics explains heredity with genetic material and its transmission.

What distinction matters when explaining adaptation today?

Modern evolutionary biology separates the origin of heritable variation from selection's effects on populations.

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