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structure in animal cells thought to form the spindle fibres during cell division.
a ductless gland that secretes hormones directly into the bloodstream, to be transported to...
minute pores in the epidermis of a leaf or stem which allows for movement of gases and water...
specialised proteins which catalyse chemical reactions and thereby speed up chemical reactions...
the part of the atmosphere that contains the ozone layer and is about 10 km above the Earth's...
undifferentiated mass of tissues that forms when small pieces of the parent plant, called...