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the development of a distinct head, with a concentration of nervous tissue and sense receptors at one end, known as the anterior end of an animal.
the widespread and rapid extinction of species in the present age due to negative human impact...
the end part of the digestive system that consists of the caecum, colon, rectum and anus.
a group of parasitic protozoa. There are several species of plasmodium that cause malaria in...
unicellular fungi, most of which reproduce asexually by a process called budding.
a molecule that is formed when oxygen and haemoglobin combine chemically.