Answer:
The answer is "A"
Explanation:
They cannot make their own food, they are heterotrophs
I believe is the thermoreceptors present in the skin as well as part of the brain called hypothalamus.

⭐The temperature of groundwater near a volcano <u>Increase</u>
⭐The amount of gases released from a volcano<u> </u><u>Increase</u>
⭐The strength of earthquakes close to the volcano <u>Increases</u><u>.</u>
⭐The shape of the volcano <u>Increases</u>
Hormones are chemical substances that help to regulate processes in the body. Hormones are secreted by glands and travel to their target organs in the bloodstream. Hormones can be used to control human fertility.