Why might an atom of lead and an atom of sulfur bond? All atoms want to bond.
The nucleus of the lead atom and the nucleus of the sulfur atom are attracted to
each other.
Sulfur and lead want to have a full outer shell.

the darker peppered moth species were favored due to the fact that the industrial revolution had made all the nearby trees a darker color instead of white.

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

i hope this : )