our body tells us we need more energy by feeling hungry (like your stomach is rumbling), and it also tells us by feeling tired. also if your body is short on fluids, you will start feeling fatigued.
Ur answer would be evolution
Answer:
The primary function of the plasma membrane is to protect the cell from its surroundings
Answer:
sun and electric heater
Explanation:
sun is the biggest source of heat energy
electric heater is also an example of heat energy as it warms us
