Answer: because you think a letter was easiest way to represent the elements. Another way is to use the chemical symbols and it is to allow you to write chemical formulas easily.
Explanation:
I would say <span>The trait is carried either on the X or the Y chromosome</span>
The answer is <span>Determine why the beetle is eating one tree but not the other.
The botanist should first d</span><span>etermine why the beetle is eating one tree but not the other. By determining that, he will understand what connects beetle to the tree. This will also explain does the tree benefits from this interaction or not.</span>
Answer:
where the is the picture?