Soil food webThe soil food web is the community of organisms living all or part of their lives in the soil. It describes a complex living system in the soil and how it interacts with the environment, plants, and animals. Food webs describe the transfer of energy between species in an ecosystem. While a food chain examines one, linear, energy pathway through an ecosystem, a food web is more complex and illustrates all of the potential pathways. Much of this transferred energy comes from the sun.
PaleontologyPaleontology (ˌpeɪliɒnˈtɒlədʒi,ˌpæli-,-ən-), also spelled palaeontology or palæontology, is the scientific study of life that existed prior to, and sometimes including, the start of the Holocene epoch (roughly 11,700 years before present). It includes the study of fossils to classify organisms and study their interactions with each other and their environments (their paleoecology). Paleontological observations have been documented as far back as the 5th century BC.
Pre-industrial societyPre-industrial society refers to social attributes and forms of political and cultural organization that were prevalent before the advent of the Industrial Revolution, which occurred from 1750 to 1850. Pre-industrial refers to a time before there were machines and tools to help perform tasks en masse. Pre-industrial civilization dates back to centuries ago, but the main era known as the pre-industrial society occurred right before the industrial society.
21st centuryThe 21st (twenty-first) century is the current century in the Anno Domini or Common Era, in accordance with the Gregorian calendar. It began on 1 January 2001 (MMI) and will end on 31 December 2100 (MMC). It is the first century of the 3rd millennium. It is distinct from the century known as the 2000s, which began on 1 January 2000 and will end on 31 December 2099. The rise of a global economy and Third World consumerism marked the beginning of the century, along with increased private enterprise and deepening concern over terrorism after the 9/11 terrorist attacks.
