RESPIRATION-->
respiration biochemical process in which cell of an organism obtain energy by combining oxygen with glucose and carbon dioxide is released.
1. air is drawn into the body through the nostrils.
2. the air from the nasal cavity passes through phyrnax which leads to trachea.
3. the tracheas runs down the neck and divide into two bronchi and led it in the lungs and then finally to the alveoli.
4. the wall of alveoli are thin and have extensive network of blood vessels and gaseous exchange take place.
5. as a result oxygen from the breadth diffuses into the body and carbon dioxide from the body diffuses out into the air.
EXCRETION-->
it is the process by which waste of the body is eliminated out of the body it includes a pair of kidney a pair of ureters, urinary bladder and urethra.
Process-->
1.kidney remove the waste from Blood and urine
2. the blood enters the kidney through a long renal artery branches in to many capillaries associated with the glomerulus.
3. from there the filtrate then move down to the loop of Helen where more water is absorbed and the waste added to the urine.
4. the filtrate then in the form of urine move to the collecting duct the collecting duct collect urine from many nephrons.

Respiration is a chemical reaction that takes glucose (sugar) and oxygen to produce energy. But it also produces water and carbon dioxide as bi-products. Excretion gets rid of carbon dioxide, water, and other, possibly harmful, substances from your body.