Question 3 (1 point) (03.01 MC) The table below shows the half-life of an element: Half-Life Data Element Half-Life Uranium-235 700 million years Scientists have found that the Uranium-235 content of an unknown prehistoric sample was reduced to one-fourth. What best describes the identity of the sample? (1 point) a A stone artifact that formed 700 million years ago b A mammoth that died 1,400 million years ago c A cliff that formed 1,400 million years ago d A plant that died 700 million years ago

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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