Match column A with column B

A	B
P. Temperature affecting coloration of animals	a. Jordan’s rule
Q. temperature affecting size of extremeties of certain animals	b. Bergman’ rule
R. temperature affecting size of animals	c. Gloger’s rule
S. temperature affecting number of vertebrae in certain fish	d. Allen’s rule

Jordan's rule named after the father of American ichthyology David Starr Jordan describes the inverse relationship between water temperature and meristic characteristics. The most common found relationship is for fin ray, vertebrae, or scale numbers to increase with decreasing temperature. Bergmann's rule is an ecogeographic principle that states that within a broadly distributed taxonomic clade, populations and species of larger size are found in colder environments, and species of smaller size are found in warmer regions. Gloger's Rule is a zoological rule which states that within a species of endotherms, more heavily pigmented forms tend to be found in more humid environments, e.g., near the equator. It was named after the zoologist Constantin Wilhelm Lambert Gloger, who first remarked upon this phenomenon in 1833 in a review of covariation of climate and avian plumage colorAllen'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.