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animals with three cellular body wall layers: the ectoderm, mesoderm and endoderm.
the parts and processes of the body that recognise and fight pathogens, such as viruses and...
an autoimmune disease which is treated with insulin injections.
this muscle 'opens' or straightens the joint when it contracts (so the angle between the two...
the cylinder of parenchyma found from the centre of the stem to the inside of the vascular...