Canals and aqueducts allow humans to transport people and goods from one place to another place.
<h3>What are Canals and aqueducts?</h3>
A canal is a man-made waterway that link up two bodies of water and allows boats and ships to travel between them.
Aqueducts are water-conducting constructions that carry a stream of water over a hollow or valley.
Canals and aqueducts differ slightly in that a canal is an architectural waterway that connects one body of water to another, whereas an aqueduct is an artificial channel built to transport water from one site to another.
Therefore, oprtion d is the correct option.
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All the following products made from petroleum expect GASOLINE.
The answer is that "since they do not interact with the electromagnetic force, they do not feel friction or drag and hence do not contract with the rest of the protogalactic cloud." WIMPs (Weakly-Interacting Massive Particles) are hypothetically constituted to dark matter. It is in their nature to be less interactive, so they are scattered throughout galactic halos and not focused into the galaxy's disk.