This evidence may include comparison with deposits of similar type. The union enables both partners to survive in conditions that are unfavourable if they were to exist separately. A member of the Mammalia, a class of vertebrates whose young feed upon milk from the mother's breast. A group of mainly aquatic invertebrates with a soft, unsegmented body and often a shell. Most have a radula, a large muscular foot and a fleshy mantle covering the internal organs which, in some forms, secretes a thin shell.
Most forms possess one or two gills.
An order of mammals unique to the Australian region and comprising only the platypus and the echidnas. A class of cold-blooded vertebrates, including the lizards, snakes, turtles, alligators and various extinct types. The area drained by a stream and its tributaries where surface runoff collects. In an area of uncoordinated drainage, drainage patterns define a basin. Energy derived from the direct conversion of sunlight.