Amino acids joining together to make a peptide is a good example of a reaction.

a) synthesis
b) exchange
c) decomposition
d) reversible

Synthesis

Explanation: Amino acids are building blocks of proteins. They are joined together by a chemical bond formed between the carboxyl group of one amino acid with the amino group of another amino acid to form a peptide bond. This reaction is a dehydration synthesis reaction.

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

dude i stopped reading after the first 7 words but hey you seem real smart thats awesome have a great day