Which of the following statements is correct with regard to Bergmann's rule?

Options

A. Animals of colder area have large size than of hot areas.
B. Fish of colder area have large size
C. Birds of colder areas have narrow winds
D. Animals of colder areas posses thick fur

Answer

A

Explanation

Animals of cold areas posses thick coat of hair, scales, feathers and subcutaneous fat (Gloger's rule). Warm blooded animals (birds, mammals) of colder arease are of larger size as compared to those of warmer areas (Bergmann's rule). Extremities of mammals (ears, snout, tail, legs) of colder areas are shorter than those of warmer regions (Allen's rule). Birds have narrow wings in cold areas as compared to those of warmer regions (Ransch's rule). Fish of colder waters tend to have more vertebrae (Jordan's rule).