Nitrogen and hydrogen
N2 +3 H2 ---> 2NH3
hope that answers the question:)
<h2>Answer:</h2>
Option C is correct.
C. lower the activation energy so the reaction rate will increase
<h2>Explanation:</h2>
Enzymes are protein molecules in cells which work as catalysts. Enzymes speed up chemical reactions in the body, but do not get used up in the process. Almost all biochemical reactions in living things need enzymes. With an enzyme, chemical reactions go much faster than they would without the enzyme.
Think about skin cells. Skin cells shed every day, if cell division didn't take place, you would just constantly be losing skin cells.
Answer:
A
Explanation:
It is believed that the moon was formed shortly (relative time) after the earth was newly formed. This occurred in a massive planet-sized collision that ejected a huge chunk of the earth out into space. The chunk, still within earth gravitational reach, began orbiting the earth becoming the moon. Both earth and moon are slightly more than 4 billion years old.
