In geometric progression, the ratio of each number to the preceding one is the same. which is an example of a geometric progression? a. 4, 12, 36 b. 3, 21, 35 c. 1, 2, 3 d. 4, 6, 8

your answer is A because a geometric progression is increased by a factor of 3, therefore 4x3=12 and 12x3=36.

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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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explanation: