Which of the following does not describe the process of summation?
a. two espss are generated at the same time by two separate synapses, bringing the cell to threshold. b. one epsp and one ipsp cancel each other out. c. two epsps occur close enough in time to bring the cell to threshold. d. one epsp fails to bring the cell to threshold.

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.

i think its through the fallopian tube