Your body heat.
You are.
The heat source that melts chocolate in your pocket is your body heat. The human body maintains a temperature of around 98.6°F (37°C), which is sufficient to soften and melt chocolate, especially if it contains cocoa butter. Additionally, the warmth from your pocket can further increase the temperature, making it easier for the chocolate to melt.
Yes Chocolate is a rich source of protein
Generally, the source is melting snow and ice, rain can be a source too.
melting snow
Tropical region of the Americas. Chocolate is made from cocoa beans.
It actually isn't. Chocolate is a good source of energy.
The amount you pay that is not reimbursed by any source.
A source of a river is where it starts. A source can be melting glacial ice, marshes or a water spring.
Cooling the heat source
vegetable origin
Yes there are cockroaches in chocolate, however not enough to harm you, as a matter of fact its inevitable that there are cockroaches in chocolate. Source: A friend who works at a chocolate factory and research (Google).