Answer:
They developed Trigonometry, used mathematical models to track down the planet Jupiter and developed methods of tracking time that are still used today.
<span>a. Volunteering at a local homeless shelter
Helping the homeless people in the community is already an activity under "community involvement."
</span>
<span>In the 1860s and 1870s, hundreds of tenements are built, primarily on the Lower East Side and in other neighborhoods of southern Manhattan, as more and more poor immigrants are arriving in New York City. When these tenements were built, there were almost no laws regulating tenement construction.</span>
Fractional distillation
heated crude oil enters a tall fractionating column , which is hot at the bottom and gets cooler towards the top. vapours from the oil rise through the column. vapours condense when they become cool enough.
