What is Allen's rule ???
what is the full form of CAM ??
Allen's rule is a biological rule posited by Joel Asaph Allen in 1877. It states that endotherms from colder climates usually have shorter limbs (or appendages) than the equivalent animals from warmer climates.
allen rule states that organism having smaller limbs has larger surface area due to which the heat of the body escape out <more the surface area mor will be the heat loss> therefore they r rarely found in cold regionsexample kangroo rat are found in deserts due to large Surface area they profuse heat easily!!........:)