The evidence that scientists currently have suggests that life on earth a. began in the water b. first evolved around 3,500 million years ago c. began as single-celled organisms d. a and b e. all of the above

e. all of the above

Explanation:

Life could not arise in the continents because at the time there was no ozone layer. Intense u.v rays alter dna generating mutations that would not allowed for species to thrive.

Fossil records (prokaryotes) from 3.5 billion years ago have been found, these  fossil show single cell organisms.

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 answer is b. glad to .