List two disadvantages of friction.

List two advantages of friction.

List the disadvantages of insulin obtained from the pancreas of slaughtered cows and pigs.

State two advantages and two disadvantages of producing hydro electricity.

Enlist the steps involved in the inbreeding of cattle. Suggest two disadvantages of this practice .

Compare and contrast the advantages and disadvantages of production of genetically modified crops.

State two disadvantages of cross pollination.

State two advantages and two disadvantages of using nuclear energy for producing electricity.

Explain enzyme-replacement therapy to treat adenosine deaminase deficiency Mention two disadvantages of this procedure.

Explain enzyme-replacement therapy to treat adenosine deaminase deficiency? Mention two disadvantages of this procedure.

List two advantages of the use of unleaded petrol in automobiles as fuel.