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The '''surface area to volume ratio''' explains why
*A [[mouse]] will freeze quicker in cold [[temperature]]s than a [[bear]] because the larger the [[Surface Area|surface area]] the quicker an [[object]] can [[emit]] [[Thermal Energy Store|thermal energy]] and the smaller the [[Volume (Space)|volume]] the less [[Thermal Energy Store|thermal energy]] in the [[object]].: A [[mouse]] has a large [[Surface Area|surface area]] compared to its [[Volume (Space)|volume]] so it loses [[Thermal Energy Store|thermal energy]] quickly.
*[[Multicellular]] [[organism]]s need specialised [[tissue]]s with large [[Surface Area|surface areas]] to [[absorb (biology)|absorb]] [[nutrient]]s and [[Oxygen]] because the larger the [[Surface Area|surface area]] the quicker an [[object]] can [[absorb (Biology)|absorb]] [[chemical]]s and the larger the [[Volume (Space)|volume]] the more [[chemical]]s the [[object]] needs.