What are some ways immigrants have contributed to the United States? Check all that apply.

The blank theory suggests that the sun, planets, and other celestial bodies of the solar system came from a cloud of dust and gas? a.) condensationb.) steady state c.) big bang d.) nebular

What body of water is the second cataract of the nile river submerged under

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4