Which element is found in nucleic acids but not in proteins?
carbon
hydrogen
nitrogen
phosphorus

phosphorus is found in nucleic acids but not in proteins

Explanation:

Carbon, hydrogen and oxygen (C, H, O) participate in the composition of organic compounds such as carbohydrates, lipids, proteins and nucleic acids.

Nucleic acids are formed by: carbon (C), hydrogen (H), oxygen (O), nitrogen (N) and phosphorus (P).

Proteins are biomolecules. 5 elements are  found in most proteins: carbon (53%), hydrogen (7%), oxygen (23%), nitrogen (16%) and sulfur (1%). Nitrogen differentiates proteins from fats and carbohydrates.

Then we can see that phosphorus is found in nucleic acids but not in proteins

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