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specialised proteins which catalyse chemical reactions and thereby speed up chemical reactions...
the outer most layer of tightly packed modified parenchyma cells in plants.
the cartilaginous flap at the top of the mammalian trachea, which closes off the entrance to the...
tissue that covers the surfaces of the body (the skin) and lines the ducts of the gut.
epithelial tissue that lines the inner spaces of the body or organs.
a very long time span in the Earth's history, covering tens or hundreds of millions of years....
ecotourism that is carried out thoughtfully, morally and in a way that is acceptable to all...
organisms whose cells have a true nucleus and true organelles. These structures are not...
animals that live socially or in colonies and perform certain tasks for the good of the colony...