Footprints Group of answer choices cannot be fossilized. have been preserved in abundance in South African caves such as Swartkrans. are all that have been discovered of human ancestors prior to about 100,000 years ago. of early human ancestors were found in fossil beds at Laetoli, Tanzania, dating to about 3.5 million years ago.

Option D (of earlyago) is the right alternative.

Explanation:

Other given three alternatives aren't connect to the scenario. Thus the above is the right one.

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.

true is the final answer!