Facts about synthesis

If a chemical synthesis starts from basic laboratory compounds and yields something new, it is a "purely synthetic process". If it starts from a product isolated from plants or animals and then proceeds to a new compounds, the synthesis is called a "semisynthetic process".

the answer for this question would be d. glaciers

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.