List two advantages of friction.

List two disadvantages of friction.

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

List the advantages of recombinant insulin.

List the advantages of pollination to angiosperms.

Write two advantages of frequency modulation over amplitude modulation.

Write two advantages of a reflecting telescope over a refracting telescope.

List two advantages associated with water harvesting at the community level.

List the advantages of a seed in gymnosperm.

(a) Identify the diagram. Name the parts 1 to 5. (b) What is contraception? List three advantages of adopting contraceptive measures.

Mention two advantages for lactational amenorrhea as a contraceptive method.