State the enzyme that catalyses the digestion of starch and fat.

Here are the answers to your questions:

a) (i)

1. The enzyme that catalyses the digestion of starch is amylase.
2. The enzyme that catalyses the digestion of fat is lipase.

a) (ii)
The end product of the digestion of protein is amino acids.

b)
One adaptation of the alveolus for efficient gaseous exchange is its thin walls (one cell thick).

c)
The question for part (c) is incomplete in the provided image, so I cannot answer it.