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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.
undifferentiated and unspecialised actively dividing cells in the growth regions of plants, such...
the nervous system outside the brain and spinal column.
the layer of fatty material that is usually only surrounds the axon of a neuron. It is made from...
single-celled algae that have two flagella and are found mainly in seawater but are also common...
a small, corky pore or narrow line on the surface of the stem of a woody plant that allows the...