B1.6

Question 1

Process of decay

Answer 1

• bacteria and fungi
• digested by microorganisms
• microorganisms release enzymes
• enzymes break down compounds, to be absorbed by their cell

Question 2

What are the best conditions for decay?

Answer 2

• a lot of oxygen(respiration)
• a lot of water(needed for transport)
• moist

Question 3

The carbon cycle

Answer 3

• co2 is removed from the atmosphere by photosynthesis
• due to respiration some carbon goes back into the atmosphere
• carbon also becomes fats as animals eat the plants
• animal waste is broken down
• wood and fossil fuels are Burnt realising co2 back into the atmosphere