1 what is the most effective way to combine sentences 6 and 7? a using the large, powerful telescopes…

1 what is the most effective way to combine sentences 6 and 7? a using the large, powerful telescopes located at observatories in chile and hawaii, scientists determined that billions of years ago, mars held a primitive ocean as large as earth’s arctic ocean. b billions of years ago, mars had an ocean as large as the arctic ocean on earth, and this discovery was made by scientists with the help of telescopes in chile and hawaii. c two powerful telescopes located in chile and hawaii are the reasons that scientists could determine that mars once had a large arctic ocean. d scientists used two telescopes to confirm that mars once had a very large and cold ocean.

1 what is the most effective way to combine sentences 6 and 7? a using the large, powerful telescopes located at observatories in chile and hawaii, scientists determined that billions of years ago, mars held a primitive ocean as large as earth’s arctic ocean. b billions of years ago, mars had an ocean as large as the arctic ocean on earth, and this discovery was made by scientists with the help of telescopes in chile and hawaii. c two powerful telescopes located in chile and hawaii are the reasons that scientists could determine that mars once had a large arctic ocean. d scientists used two telescopes to confirm that mars once had a very large and cold ocean.

Answer

Brief Explanations:

We need to find the most grammatically - correct and clear way to combine the two sentences. Option A clearly states that scientists used the telescopes in Chile and Hawaii to determine Mars' past ocean. Option B has an incorrect preposition "as large with". Option C is convoluted in its structure. Option D is too general as it doesn't mention the size comparison and the specific locations of the telescopes.

Answer:

A. Using the large, powerful telescopes located at observatories in Chile and Hawaii, scientists determined that billions of years ago, Mars held a primitive ocean as large as Earth’s Arctic Ocean.