* 7. Explain why there is a difference in the amount of oxygen taken in at rest and during the vigorous activity. (3) * tatti (3) 8. Explain how the body is able to increase its oxygen Intake during exercise NBI NBI NBI NBI NBI NBI NBI Obtain a lung from the butcher/ slaughter house to illustrate the function of TOTAL 30 MARKS​

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.

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