Xian drew a diagram to compare deletion mutations and substitution mutations.

Which label belongs in the area marked "X"

1. May change the type of amino acid.
2. Decreases the number of bases in the sequence.
3. Does not change the type of amino acid.
4. Increases the number of bases in the sequence.

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c

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