11. 7. Solutos que normalmente no se encuentran en la orina: a. Urea
b. Creatinina
C. Ácido úrico
d. Cuerpos cetónicos
e. Naci

answer; i believe the correct answer is ( proteins );

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.

the supermassive black hole is in the middle of the galaxy.

thats not even an aswer choice