1. Biotechnology is a broad discipline in which biological processes, organisms, cells or cellular components are exploited to develop new technologies. New tools and products developed by biotechnologists are useful in research, agriculture, industry and the clinic.


the science or practice of farming, including cultivation of the soil for the growing of crops and the rearing of animals to provide food, wool, and other products.

fossil fuels

  1. a natural fuel such as coal or gas, formed in the geological past from the remains of living organisms.

sedimentary rock

  1. Sedimentary rocks are types of rock that are formed by the deposition of material at the Earth's surface and within bodies of water. Sedimentation is the collective name for processes that cause mineral and/or organic particles (detritus) to settle and accumulate or minerals to precipitate from a solution.

atomic number

  1. the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.

law of superposition

  1. Geology. a basic law of geochronology, stating that in any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest on bottom, each layer being younger than the one beneath it and older than the one above it. law of superposition in Science Expand.


the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.

natural selection

  1. the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution.

homologous structure

example of an organ or bone that appears in different animals, underlining anatomical commonalities demonstrating descent from a common ancestor. In other words, it's when very different animals have bones that appear very similar in form or function and seem to be related.

index fossil

  1. a fossil that is useful for dating and correlating the strata in which it is found.

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