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Card 16
Front
Why is classification useful?
Back
Card 17
Front
What changes can cause extinction?
Back
Card 18
Front
Why do you hardly ever get food chains with more than about five stages?
Back
Card 19
Front
How can you calculate the efficiency of energy transfer?
Back
Card 20
Front
What is the carbon cycle powered by?
Back
Card 21
Front
What happens when plants and animals decompose?
Back
Card 22
Front
Why can't nitrogen from the atmosphere be used directly by plants or animals?
Back
Card 23
Front
What is nitrogen fixation?
Back
Card 24
Front
What are the two ways nitogen fixation happen?
Back
Card 25
Front
What is the role of decomposers?
Back
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