Answer:
I, II, and IV
Explanation:
"Race" is not an answer as it means "Ethnicity".
Ethnicity can be simply described as a person's identification in related to a certain group of peoples with a certain value system, culture and language.
In this case, all, the speaking language, cultural traditions and the shared common history identifies one group of people from another.
Answer:
The physical features contributed to the settlements because they were able to create/make sailboat and the wheel.
Explanation:
they did this because it was a land between two rivers that where tigris and euphrates.
Answer:
The BOD5 for this sample is 5 mg/L
Explanation:
The BOD5 takes into consideration the difference between the initial DO and the final DO divided by the fraction of the sample tested in a 300 mL BOD flask. The problem states that the sample was directly placed in a BOD bottle so we assume that the volume used was 300 mL of the water sample. The fraction of water is 1 (300/300).

BOD5 = (10-5)/1
BOD 5 = 5 mg/L
Answer:
c) The eruption at point A would be quiet because the magma that squeezes out through oceanic crust has low silica and gas content.