What is the primary function of the carbon cycle?

recycling the supply of carbon on earth
creating macromolecules
recycling the supply of water on earth
creating fossil fuels

The answer is Recycling the supply of carbon on earth.

Explanation:

The carbon cycle is extraordinarily important for the development of life. It is important to consider that living things are composed of a large extent of carbon and that they feed on it in various ways.

The carbon cycle begins in plants and some bacteria capable of performing photosynthesis, taking the CO2 to use it as their food, these plants and bacteria then serve as food for other animals, which when they die, go through a process of decomposition by fungi and bacteria, which cause the carbon left in the corpses to return to the earth.  Where the process starts again.

In this way it is clear that the carbon cycle is a fundamental process for life, for the maintenance of it in all its complexity, since in each phase of this it is observed how each living being takes advantage of this cycle and gives step to its continuity.

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