Surface Area, Volume, and Life
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This video explains how the relationship between surface area and volume is a key factor in determining the shape and form of living things. The video uses a series of demonstration involving diffusion into agar cubes of various sizes, applies the insights from these demonstrations towards understanding the following topics:
1) why cells are small,
2) the evolution of huge ears in elephants,
3) how flatworms can survive without a circulatory or respiratory system
4) the evolution of huge size in whales,
5) our instinct to hold our hands against our bodies when it gets cold.
Corresponds to
*International Baccalaureate Standard 2.1.6: Explain the importance of the surface area to volume ratio as a factor limiting cell size
AP Biology Topic 2.3, Cell size.
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