Biogeochemical Cycles

When plants perform __________________ they take carbon dioxide out of the atmosphere and release oxygen. 

• Cellular Respiration
• Photosynthesis
• Nitrogen Cycle 
• Aerobic Respiration

When animals perform ___________________ they take oxygen out of the atmosphere and release carbon dioxide 

• Nitrogen Cycle 
• Photosynthesis
• Aerobic Respiration
• Anaerobic Respiration

Cutting down forests and burning fossil fuels _______________ the amount of carbon dioxide in the atmosphere. 

• Increases
• Decreases
• Doesn't change

Carbon is present in the atmosphere as

• Carbon Monoxide
• Carbon Phosphide
• Carbon Dioxide 
• Carbon Hydroxide

__________________ use carbon the produce food. 

• Decomposers
• Producers
• Primary Consumers
• Secondary Consumers

________________ is cycled through deforestation, absorption, burning fossil fuels and decomposition. 

• Carbon
• Nitrogen
• Oxygen
• Phosphorus

All living things need _____________ to make proteins. (it's used to make DNA) 

• Carbon
• Nitrogen
• Oxygen
• Phosphorus

Bacteria break down _______________ containing compounds to form ammonia. 

• Carbon
• Oxygen
• Nitrogen
• Phosphorus

Plants and algae need bacteria to break down ___________, and absorb it from the ground or water to grow. 

• Carbon
• Oxygen
• Nitrogen
• Phosphorus

____________ exists in our air in many different forms, such as, ozone, water, and carbon dioxide. 

• Carbon
• Oxygen
• Nitrogen
• Phosphorus