Which of the following is most responsible for el niño?
unusually cold water in the atlantic causes an increase in wind activity.
the calming down of trade winds in the pacific, which leads to the buildup of warm water.
death of plankton and fish in the northern hemispheres.
disruption of the gulf stream.

this is the awnser

Explanation:

Unusually cold water in the Atlantic causes an increase in wind activity.

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.