Atheory is revised as new scientific evidence is brought to light

A theory has to be revised in the event of a new scientific evidence discovery.

Explanation:

This is because for an hypothesis to be passed to a theory, substantial scientific evidence has to be provided.

An existing theory, in the light of new found scientific evidence attached to it, has to be revised for the inclusion of the new found light.

The revision is done to update the theory as per the newly found light or to drop it if the newly found scientific evidence disapproves it.

i'd say that the moon rock is about 2.2 billion years old.

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.