Now that you’ve created a scale model of the solar system, describe the relative distances between the planets. What patterns, or similarities, do you notice? How do these distances affect the amount of time it takes each planet to orbit the Sun? If possible, snap a photograph of your model.

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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.

the tricuspid valve is present between right atrium and right ventricle