NEED HELP ON EXAM
Which element is necessary to form a protein molecule but not a carbohydrate
molecule?
Question 3 options:

A. carbon

b. nitrogen

c. oxygen

d. hydrogen

How are prokaryotic and eukaryotic cells similar?
Question 7 options:

A. Both contain cell walls.

B. Both contain a nucleus

C. Both contain ribosomes

D. Both contain membrane-bound organelles.

1.Nitrogen is the answer because carbohydrates contain carbon,hydrogen and oxygen.

2.They both have a nucleusprokaryotic cells are cells whose nucleus is not membrane bound while eukaryotes are cells whose nucleus is membrane bound

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

a. decomposes use carbon from dead organisms as fuel for cellular respiration, returning carbon dioxide back into the atmosphere.