This is because the modern lifestyle we're living and people are living in the US is very taxing and can cause people to feel extremely bad about themselves for prolonged periods of time. Furthermore, it's also possible people/doctors are misdiagnosing depression and saying someone is depressed when he or she actually isn't.
There are exactly 24 chromosomes in a girl cell and 24 in a boy cell.
What was the investigation? But from my best guess I'm assuming it's the second option. This may be incorrect.
<em>A<u> population </u>is a group of the same kind of living things in a ecosystem.</em>
<em>~I hope this helps! ;)</em>
