Look online for the growth of the trunk of a tree. estimate how much time does it take for a water oak to grow one inch in diameter. estimate the growth rate over a year.

One splits the atoms and molecules  the other combines them

An electromagnet is a material in which the current produces electromagnetism and is passed to the core.  so to fill in the blanks, choices would be better if there were.an electromagnet is a magnet produced by electric current with a metal core

The answer is b on edgenuity

If element x has 21 protons, element x has 21 electrons