1. Which of the following is a symbiotic nitrogen fixing microorganism in nitrogen cycle? * 1 point

Azospirillum

rhizobium

Clostridium

nitrococcus​

the correct answer is 2 and 4

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added

all these collisions do one thing, and that thing is explained in the last option. when dusst, rocks and ice collide, they harden and form giant layers of rocks or hard ice.

d)   to harden materials to form different parts of earth’s layers

hope it ,

bioteacher101