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Companion in Biological Definition

Charles Darwin

... own when he received a message that his intended companion had died, dashing his plans to visit Madeira, but ... Darwin for the position of gentleman's companion to Robert FitzRoy , the captain of HMS Beagle ... Hodge and Gregory Radick, eds., The Cambridge companion to Darwin (Cambridge, England: Cambridge ...

Phloem

... opposite directions. Phloem tissue consists of sieve-tube members and companion cells . The sieve-tube elements are large, cylindrical cells, with large ... sieve-tube element are carried out by its (much smaller but quite living) companion cell. While movement of water and minerals through the xylem is driven ...

Eugenics

... University Press, 1981). Diane B. Paul, "Darwin, social Darwinism and eugenics," in Jonathan Hodge and Gregory Radick, eds., The Cambridge companion to Darwin (Cambridge, England: Cambridge University Press, 2003), 214-239. Robert Proctor, Racial hygiene: Medicine under the Nazis (Cambridge, ...

Homunculus

... New York. Gregory, R.L. (1990) Eye and Brain: The Psychology of Seeing, Oxford University Press Inc. New York. Gregory, T.L. (1987). The Oxford companion to Mind. Oxford University Press. Ryle, G. (1949) The Concept of Mind. The University of Chicago Press, 1949. See Also philosophy of ...

Origin of life

... complex organic molecules arising gradually on a pre-existing, non-organic replication platform - silicate crystals in solution. Complexity in companion molecules developed as a function of selection pressures on types of clay crystal is then exapted to serve the replication of organic molecules ...

Parasitology

... . Veterinary parasitology The study of parasites which cause economic losses in agriculture or aquaculture operations, or which infect companion animals . Examples of species studied are Lucilia cericata , the blowfly , which lays eggs on the skins of farm animals, the maggots hatch and ...

Xylem

... ( gymnosperm xylem consists only of tracheids). Vessel elements are similar in structure to the sieve-tube members of the phloem, but they lack companion cells and do not have perforated sides as well as pores at the ends. Tracheids are much narrower cells, with tapered and perforated ends, ...
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