(a) Explain briefly four factors that affect the diffusion of substances. (b) Explain the following terms: (i) active transport (ii) transpiration. (c) Stat...

(a) Explain briefly four factors that affect the diffusion of substances.

(b) Explain the following terms:
(i) active transport
(ii) transpiration.

(c) State four ways by which plants can reduce high rate of transpiration.

(d) State the features of red blood cells and how these features adapt the cell to perform its functions.