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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 mass of tissues that forms when small pieces of the parent plant, called...
compounds that consist of any combination of elements, but do not usually contain carbon and...
a clear, colourless solution of hydrogen chloride (HCl) in water. It is a strong and highly...
microscopes that do not rely on light to produce images. They are used to study the internal...