Which of the following statements about ozone are true? select the two correct answers. 1 .ozone at ground level is harmful to human health. 2. ozone in the upper atmosphere protects earth from the suns rays. 3. ozone is for reducing smog levels. 4. trees and plants to decrease levels of ozone in the atmosphere. 5. most ground level ozone is released by vehicles.

Ozone in the upper atmosphere protects Earth from the sun's rays.

Ozone at ground level is harmful to human health.

Explanation:

Just took the test and these were right.

cuz he's blad

explanation:

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.