Takes ammonia and converts it to nitrite ions. 2nd step of nitrogen cycle is called

Nitrification.

Explanation:

Nitrification is the second step of nitrogen cycle in which the ammonia is converted into nitrates with the help of bacteria is called nitrifying bacteria. In the first step, biological nitrogen fixing bacteria fixes atmospheric nitrogen into ammonia. This process is known as ammonification. Due to this fixation, the plants is able to use the nitrogen for making amino acids in the body. So the first step is ammonification and the second step is nitrification.

a, i am pretty sure.

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.