- Life Sciences
a kingdom of plant-like unicellular and multicellular organisms that do not contain chlorophyll or vascular tissue. Their cell walls are made of chitin and they reproduce by means of spores.
this muscle 'opens' or straightens the joint when it contracts (so the angle between the two...
the second set of teeth formed in mammals. In humans there are thirty-two permanent teeth.
irreversible disease where the alveoli are damaged, resulting in breathing difficulties.