Experimental question: how does watching tv during studying affect a student's test grades? which variable is underlined?

I don't see the underline but i'll give the answer anyway

The Independent Variable: watching tv during studying

the Dependent Variable: affect student's test grades

Independent Variable is the variable being tested and Dependent variable is the effect and responds to the change.

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they are known to reach a speed of 21 miles per hour

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.