4.7

• A pyramid of energy is used
• Reasons for loss of energy:
- respiration
- excretion (energy which has not been able to be digested)
- heat loss
• Since the mouse can only use 10% of the energy from the producer, this would suggest that the owl can only use 1% of the energy it gets from eating the mouse
• When the organisms eventually die, when they will be broken down by micro organisms, which are called decomposers