One astronomical unit<span> is the approximate mean</span>distance<span> between </span>the Earth<span> and </span>sun<span>. It's about 93 million </span>miles<span> (150 million km), or 8 light-minutes.</span>
It is d, a substance that participates in a chemical reaction. You can also tell it just by looking at the stem of the term :)
The answer would be Conjugation . hope this helpful.
