Help me please... The image below shows three bones in the leg: the femur, the fibula, and the tibia.

What is the structural category of the tibia?
long
short
flat
irregular

Tibia is categorized as a long bone. (you can see how long it is in the diagram)

what are the choices?

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.