The answer is electrons.
A covalent bond is a type of chemical bond where atoms share electrons. Covalent bonds are also referred to as molecular bonds because they form molecules when bonded.
This type of bond occurs between non-metals. An example of a compound or a molecule that is formed through covalent bonding is water. It is a combination of two hydrogen atoms bonded with an oxygen atom. H₂O
This can change the hormones in women and cause mood changes which can be drastic including things like depression, stress, and anxiety. It has not been known to cause PMS but has been know to make it worse.
That looks like Pseudostratified Columnar. Could be wrong but I'm 95% certain.
Hope this helps
Approximately 1.2% (3.2 million) of US people have been diagnosed. I hope I have answered your question.
