a form of malnutrition caused by a severe shortage of protein in the diet.
colourless, odourless highly poisonous gas.
preserved remains or traces of organisms that lived long ago.
the space that exists between the two layers of the pleura.
the collection and disposal or recycling of waste materials and the monitoring of waste.
the most common and most movable type of joint in the body of a mammal e.g. the elbow.