What does a pyramid of biomass represent

Explanation:

To talk about the pyramid of biomass, we need to understand the definition of it.  

What is pyramid of biomass?

This is the total amount of biomass at each trophic level in an ecosystem which is represented graphically in a pyramid shape. Talking about Pyramid,it may be upright or inverted, when you imagine a tree ecosystem, where we have a single producer, tree and consumers are small birds that is why the biomass reduces when moving from producer to consumer. Hence; pyramid of biomass is upright.

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