What are the two main causes of long sightedness ?

Gametes must be produced by meiosis. Explain.

Study the diagram given below and answer the questions that follow:

(i) Name the cells of the pancreas that produce glucagon and insulin.

(ii) State the main function of glucagon and insulin.

(iii) What is the technical term for the cells of the pancreas that produce hormones?

Write two important roles of vitreous humour.