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a thin, flexible layer of the plant cell wall inside the middle lamella. It consists mainly of...
a muscle, gland or organ capable of responding to a nerve impulse in order to bring about a...
polysaccharide found in plant cell walls.
an infectious disease of the digestive system that is characterised by diarrhoeaandbloodinthe...
the development of a distinct head, with a concentration of nervous tissue and sense receptors...
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