When will you wear this? Write $\mathrm{S}$ for summer cloth and $\mathrm{W}$ for winter cloth. 

Thick, dark-coloured clothes.

When will you wear this? Write $\mathrm{S}$ for summer cloth and $\mathrm{W}$ for winter cloth. 

Clothes made of fabric that allows air to circulate freely.

When will you wear this? Write $\mathrm{S}$ for summer cloth and $\mathrm{W}$ for winter cloth. 

Clothes made of wool, fur or leather.

When will you wear this? Write $\mathrm{S}$ for summer cloth and $\mathrm{W}$ for winter cloth.

Cotton clothes. 

Only a very few animals have thick wool or fleece on their skin. Why don't all animals produce wool?

Name two kinds of fabric that are most suitable for winter and summer, respectively.

What do you understand by the term moulting?