Question

1. which process is the main reason why energy decreases at each level in a food chain? decomposition, because energy is lost when organisms die and decay. digestion, because organisms break down food to absorb nutrients. cellular respiration, because organisms use energy to live and release heat. photosynthesis, because it captures energy from the sun.

Explanation:

Cellular respiration uses energy for life - processes and releases heat, reducing energy at each food - chain level. Other options don't explain energy decrease in food chain well.

Answer:

Cellular respiration, because organisms use energy to live and release heat.