Example of of how mass and energy apply to living systems

See the explanation below.

Explanation:

The easiest example where you can see how mass can generate energy to a daily life system, is in a cabin in winter time. When you take a certain amount of logs which are burned to generate thermal energy, it will supply heat to the cabin and keep the temperature of the space in acceptable values.

Another example is in the energy content in food, these provide energy to the human being through their regular consumption, through the metabolism of each human being regulates the temperature and energy sufficient to perform daily activities.