ABC's of Biology
A is for Anatomy
B is for Bacteria
C is for Cell
From anatomy to zoology, the ABCs of Biology is a colorfully simple introduction for babies―and grownups―to a new biology concept for every letter of the alphabet. Written by two experts, each page in this biology primer features multiple levels of text so the book grows along with your little biologist.
Biology is the natural science that studies life and living organisms , including their physical structure , chemical processes , molecular interactions , physiological mechanisms , development and evolution. Despite the complexity of the science, certain unifying concepts consolidate it into a single, coherent field. Biology recognizes the cell as the basic unit of life, genes as the basic unit of heredity , and evolution as the engine that propels the creation and extinction of species. Living organisms are open systems that survive by transforming energy and decreasing their local entropy to maintain a stable and vital condition defined as homeostasis.
Sub-disciplines of biology are defined by the research methods employed and the kind of system studied: theoretical biology uses mathematical methods to formulate quantitative models while experimental biology performs empirical experiments to test the validity of proposed theories and understand the mechanisms underlying life and how it appeared and evolved from non-living matter about 4 billion years ago through a gradual increase in the complexity of the system.