(Encyclopedia) biology, the science that deals with living things. It is broadly divided into zoology, the study of animal life, and botany, the study of plant life. Subdivisions of each of these? Charles Darwinwrote The Origin of Speciesafter his voyage on the HMS Beagle, painted here by Conrad Martens.Biology is the study of life. At its broadest definition, biology covers the study of? (Encyclopedia) biological clock: see rhythm, biological. (Encyclopedia) space biology: see exobiology. (Encyclopedia) molecular biology, scientific study of the molecular basis of life processes, including cellular respiration, excretion, and reproduction. The term molecular biology was coined in 1938? (Encyclopedia) biological warfare, employment in war of microorganisms to injure or destroy people, animals, or crops; also called germ or bacteriological warfare. Limited attempts have been made in? (Encyclopedia) biological diversity or biodiversity, the number of species in a given habitat. Scientists have variously estimated that there are from 3 to 30 million extant species, of which 2.5? (Encyclopedia) marine biology, study of ocean plants and animals and their ecological relationships. Marine organisms may be classified (according to their mode of life) as nektonic, planktonic, or? (Encyclopedia) nomenclature, biological: see classification. (Encyclopedia) plasma, biological: see blood.