Cells express a limited number of genes at a time. This can result in the specialization of cells within organisms. This understanding best supports which of the following statements? Only multicellular organisms have useful, unexpressed genes.
The process of expressing genes is controlled by the cell.
Certain genes cannot be expressed by eukaryotic cells.
The expression of genes is a result of random chance.

The process of expressing genes is controlled by the cell.

Explanation:

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the right side of the picture going down is:

polymerase

protein

transport vesicle

modified protein

the left side of the picture going down is:

dna helix

single-stranded rna

endoplasmic reticulum

ribosome

golgi apparatus

protein released from vesicle

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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