The bacteria can chemically combine nitrogen with hydrogen to form ammonia (NH3). This combining process is called nitrogen fixation. Which group of organisms chemically combines nitrogen with hydrogen in a process called nitrogen fixation?

birds and reptiles

all mammals

bacteria

only aquatic plants

bacteria

Explanation:

they are decomposers. they decompose dead material by fixing nitrogen

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the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.