To analyze the scenario:
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The forward force is 5 N.
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The backward friction force is 4 N.
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The net forward force is 5 N - 4 N = 1 N forward.
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The upward force is 10 N.
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The downward gravity force is 10 N.
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The net vertical force is 10 N - 10 N = 0 N.
With these calculations, the animal has a net force of 1 N forward and 0 N vertically (meaning no vertical movement).
Therefore, the correct response is: "It only moves forward because there is a net force forward."