I imagine, it's A, they get a sense of the history of the area they are investigating.
The troposphere is mostly heated by the transfer of energy from the surface. <span />
(Please vote me Brainliest if this helped!)
Water footprint: (noun) the amount of fresh water utilized in the production or supply of the goods and services used by a particular person or group.
Basically, it's a measure of humanity's appropriation of fresh water in volumes of water consumed and/or polluted.
<span>Carbon dioxide, a waste product of
metabolism, travels from the blood to the alveoli, where it can be
exhaled. Between the alveoli is a thin layer of cells called the
interstitium, which contains blood vessels and cells that help support
the alveoli.</span>
