Based on the information in this passage, which of the following is a reasonable conclusion? A- Scientists will never change the classification system again.

B- Scientists know everything there is to know about all organisms.

C-Scientists have never changed the classification system.

D-New scientific discoveries could change the current classification system.

(Science Question btw)

the answer is A

Explanation:

Because there is no passage which I guessed

the sphincter muscles at the end of the digestive tract is the anus.

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.