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list of questions or statements that are used to classify or identify a living organism.
structure in animal cells thought to form the spindle fibres during cell division.
the engulfment of food particles with pseudopodia to form a food vacuole inside the cell. This...
a plant body consisting of one or more cells. It is not differentiated into root, stem and...
mass extinction event of 250 million years ago, in which about 90% of all species on Earth died...