Due to climate and soil factors, in what biome would you expect to find the fewest burrowing animals

An Alaskan tundra. The soil in tundra is permanently frozen (permafrost), meaning that burrowing would be difficult for most animals.

the answer is b.) hydrogen bonds between bases.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.