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the second biological classification group (taxon) that is divided into phyla (for animals) or divisions (for plants). There are five or six kingdoms in the main biological classification system.
a thin, flexible layer of the plant cell wall inside the middle lamella. It consists mainly of...
the cylinder of parenchyma found from the centre of the stem to the inside of the vascular...
a chemical messenger produced and released by a cell or a gland in one part of the body of the...
ecotourism that is carried out thoughtfully, morally and in a way that is acceptable to all...
blood that has no antibodies (blood group AB) and can receive any type of blood.