3the etowah indian mounds historic site, located near the etowah river, has six mounds. three of the mounds—called a, b, and c—are the most famous features of the site. native americans built the mounds beside two, open plazas. the mounds have four sides and flat tops. native americans used steps to get to the tops of the mounds. they also built a ditch that served as a protective barrier around the mounds. in paragraph 3, what point is the author making when she describes a ditch surrounding the mounds? a) the ditch could stop others from invading the town. b) the ditch was added to make the site more beautiful. c) the native americans were skilled at making ditches. d) scientists cannot research the site because of the ditch.

The correct answer is A. The ditch could stop others from invading the town

Explanation:

In the excerpt presented the author describes the way the structure "The Etowah Indian Mounds" is organized, which was built by an indigenous group called the Muscogee. For doing this, the author describes the structure is compounds by six different mounds and these are built close to two open plazas (organization of the mounds). Additionally to this, the author describes around the mounds the Muscogee created a ditch and mentions the main function of this ditch was that it "served as a protective barrier". By using these details and especially  the detail "served as a protective barrier" the author show the purpose of stating the ditch was built around the structure of the mounds is to show to the reader the ditch was used from protection or that the ditch could stop others from invading the town as it separated the mounds where the people of the tribe were from the rest of the territory working as a barrier for possible enemies.

c. in order of atomic number

the rocket launch by showing how the population around it changes its behavior as the earth's influence over the martian planet when he uses the term "green star".

explanation: