In some cases, neurotransmitter will bind to a receptor and activate a G protein whose function is to activate adenylate cyclase. Adenylate cyclase converts ATP to cAMP, which leaves the plasma membrane to go into the cell and activate a protein kinase A. Protein kinase A phosphorylates K^+ channels, causing them to close. Based on this information, which of the following statements is correct?

a. The initial receptor was indirectly linked to the K^+ channel.
b. Protein kinase A is the second messenger in this pathway.
c. This response pathway would lead to an IPSP
d. The K^+ channel is a voltage-gated channel.

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

that's all i luck!