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Answer each question and check where every mark went.
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Structured questions0 / 4
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Question 1
A team of ecologists studied a grassland ecosystem. They recorded the organisms present and the feeding relationships between them.
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10 marksOpen › - 2
Question 2
Nitrogen is recycled between the air, the soil and living organisms. Most of this recycling is carried out by bacteria.
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10 marksOpen › - 3
Question 3
Variation exists between the individuals of a species. Some of this variation is inherited.
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10 marksOpen › - 4
Question 4
Allele frequency in a population can be changed by natural selection and by artificial selection.
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10 marksOpen ›