Answer:
C. Nitrogen
Explanation:
One way to get this answer is through context clues and knowledge of basic chemistry:
<em>Ammonia, or </em><em>NH3 is a gas that only contains nitrogen and hydrogen</em><em>. Of all our answer choices, only (c.) Nitrogen is present in ammonia</em>
Another way to solve this is by considering biology,
<em>in which we know that plants rely on the </em><em>nitrogenous wastes</em><em> in soil to help with growth. </em>
Answer:
Ferns and conifers evolve in Paleozoic era
first line would be tT then the second one is tT
The kingdom is the answer