6. A gland that secretes hormones directly into the blood. They have no ducts.
Endocrine gland
Hormones
Exocrine gland
7. The removal of metabolic waste from the body.
Excretion
Metabolic waste
8. Waste substances that may be toxic or are produces in excess by the reactions inside cells.
Metabolic waste
Excretion
9. Organisms that ingest and digest complex organic molecules releasing the potential energy stored in them.
Hetrotrophs
Autotrophs
10. Organisms that use light energy or chemical energy and inorganic molecules (carbon dioxide and water) to synthesise complex organic molecules.
Autrotroph
Hetrotroph
11. Molecules that absorb light energy. Each absorbs a range of wavelengths in the visable region and has it's own distict peak of absorbtion. Other wavelengths are reflected.
