What is the function of the vena cava in the human circulatory system?

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What are veins and what are their main characteristics in the human circulatory system?

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Name two fungal diseases that affect plants.

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How do fungi differ from bacteria?

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Name four types of arthropods and give an example of each.

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How do earthworms benefit the soil?

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How do crustaceans differ from insects?

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How do we see objects that do not produce their own light?

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