Answer:
Dams, reservoirs, and aqueducts were constructed throughout the Islamic Empire as early as the tenth century. Muslims also perfected the water wheel, a technique that could be operated by man, animals or the wind.
It's an informative piece, one to tell the reader about facts and not your opinions <span />
The purpose of the ad is to encourage people to take steps to avoid illness, as shown in the last answer option.
We were able to reach this answer because:
- The announcement shows how prevention measures must be followed to avoid the spread of diseases.
- This is done to ensure the safety of the population, avoid overburdening the health service and protect those most sensitive to infections.
Thus, the advertisement fulfills a public service function which is to promote the protection of society.
More information about the public service at the link:
brainly.com/question/14452199
Figurative - the channels are not literal or physical.
