Researchers aboard the international space station use the latest technology to advance our understanding of which object? check all that apply

answer; ///(b) it is composed of four protein chains and four heme groups;

i might be wrong but i think its a. let me know if i’m right and have a good rest of your day!

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.