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Match the interspecific relationship definitions with how it affects a population, + means one of the two populations are benefited, - means one of them is put at a loss, O means a population that is not affected

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Match the text
Competition
Mutualism
Commensalism
Amensalism
Predation / Antagonism

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- O
+ +
+ -
+ O
- -

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Complete this example food chain

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primary consumer

>

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Click the correct statements about nutrient cycling

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Decomposers decay dead organisms

Animal respiration is the only way that carbon dioxide is returned to the atmosphere

Nutrients are recycled within an ecosystem

Energy is recycled within and ecosystem

Nutrients are passed on along the food chain

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Pick the two characteristics of a pyramid of mass

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The transfer of energy goes further down the pyramid

The transfer of energy goes further up the pyramid

Must be pyramid shaped

Always make an almost perfect triangle

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What is the definition of evolution?

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The gradual change in the characteristics (genes) of an organism over time

The gradual change in the characteristics (genes) of a species over time

The gradual change in the characteristics (genes) of a population over time

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Vitamins and minerals:

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Vitamins and

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are an important part of an animal's diet, plants will also take them from the soil, the lack of a certain

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has it's symptoms, for example scurvy, which occurs from a lack of vitamin C. Fibre is for example, an important part of our diet because it helps the right kinds of

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grow. But the dissolving of most other chemical substances and allowing chemical reactions is done by

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Put the events in order of how natural selection works

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1
2
3

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Individuals in a species show variation
The individuals with the most suitable characteristics are most likely to survive
Surviving individuals can reproduce and pass on the successful genes

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Click the correct statements about food chains

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A food web is a web made of food

Plants are usually the first organisms in a food chain

All the 'consumers' in a food chain are carnivores

The arrows in a food chain represent the transfer of energy on a trophic level

Each animal is part of only one food chain

A food web is a number of interconnected food chains