b) State two differences between endocrine and nervous system.

Here are the answers to the questions:

b) State two differences between endocrine and nervous system.

• The nervous system transmits electrical impulses, while the endocrine system transmits chemical hormones.
• The nervous system provides a rapid, short-term response, while the endocrine system provides a slower, long-term response.

c) Figure 5 is a diagram showing a cross section of a villus.

(i) Identify the parts labelled X and Y.
X: Epithelial cells
Y: Lacteal

(ii) State one end product of digestion which is transported by part Y.
Fatty acids and glycerol (or fats).

9. a) Mention any two factors that can lead to formation of new species.

• Geographical isolation
• Reproductive isolation