What types of actions in cities would be effective in increasing urban biodiversity?

Which of the following would be a body response when stepping outside without a coat on a snowy day? a. senaceous glands. secrete more senum b. more liquid is transported by the body to the skin fir insulation c. blood vessels in the skin narrow and contract d. blood vessels in the skin expand

I’m stuck on this question cuz i’m stupid sksksksk

What are the two functions of the respiratory system