Students were asked to create a model of stem cell differentiation. The diagram shown is the model that they created and used to help them explain cell differentiation. Based on the model, what process is referred to as self-renewal?
A. Mitosis
B. Differentiation
C. Meiosis
D. Specialization

D. Specialization

Explanation:

The cell is changing its form to fill out a certain task.

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.

silty loam

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