1. Yes, the water become septic if the dissolved oxygen drops to zero. Organic pollution (biodegradable) is an example.

    Yes, the water become septic if the dissolved oxygen drops to zero. Organic pollution (biodegradable) is an example.

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  2. As one moves from the equator to the polar regions, the length of the day decreases and the length of the night increases. The length of day and night are the same at the equator.

    As one moves from the equator to the polar regions, the length of the day decreases and the length of the night increases. The length of day and night are the same at the equator.

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