Your classmate asks your teacher why viruses are so hard to define. Her response would likely be:

"Scientists from all over the world study them and can't agree on the same definition."

"New viruses that don't fit our definitions are discovered all the time."

"Viruses are good for humans, and others are harmful."

"Some viruses are good for humans, and others are harmful."

"New viruses that don't fit our definitions are discovered all the time."

c

explanation:

i think

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.