Nitrogen in the air is changed by nitrogen-fixing bacteria in the soil into nitrates, which plants can absorb and use. The nitrates absorbed by the plants are passed on to animals that eat the plants, and the nitrogen is eventually returned to the
Back
Card 19
Front
How nitrogen levels can drop
Back
Card 20
Front
What is necessarywhen the interests of wild life and humans conflict
Back
Card 21
Front
What are the advantages of intenive farming
Back
Card 22
Front
What are the disadvantages of intenive farming
Back
Card 23
Front
Why do we worry about chemicals 'entering the food chain?'
Back
Card 24
Front
What pollutants are in our environment?
Back
Card 25
Front
What are the chemicals that are our main worries in terms of food chains
