This is because elements are pure substances with only one atom. When two or more elements are combined, you get compound elements; which allows for more substances to be created.
Answer:
The DNA gets copied equally through a process called <em>mitosis</em> and the copied DNA(chromosomes) are split equally among the daughter cells.
I am not sure if I am right but, I think it is called the desertification process.
Answer:
A. Mid-ocean ridge. I'm not sure if I'm right.
