Energy

Energy is essential for living things as it allows them to move about , grow and develop . it also makes machines work . Most of the energy used today in homes and industries comes from fossil fuels which have been formed from the decayed animals and plants millions of years ago . this sort of fuel is non- renewable, the energy from the sun , the wind , the water the heat of rocks and even from rubbish is renewable , this sort of fuel may last for ever.