Morality -- See Ethics --subdivision Ethics under names of individual persons and legislative bodies; and subdivision Moral and ethical aspects under non-religious or non-ethical topics
Morbidity -- See Diseases --individual diseases, e.g. Cancer; and subdivision Diseases under individual organs and regions of the body, individual animals and groups of animals, classes of persons and ethnic groups, e.g. Heart--Diseases; Fishes--Diseases; Infants--Diseases; African Americans--Diseases
Morphology (Animals) -- See also the narrower term Embryology --subdivision Embryology under individual animals and groups of animals, e.g. Fishes--Embryology
Mortality, Law of -- See Mortality --subdivision Mortality under individual diseases, classes of persons, and ethnic groups for works that list or discuss the number of deaths during a given time due to a particular cause or occurring in a particular group, e.g. Cancer--Mortality; Indians of North America--Mortality