The solar system formed from the a. grouping together of asteroids. b. explosion of an interstellar sun. c. collision of two massive stars. d. collapse of an interstellar cloud.

D. collapse of an interstellar cloud.

Explanation:
The formation of the solar system was explained based on the  Nebular Hypothesis. This hypothesis states that the explosion of the supernova resulted in the disturbance of a cloud of gas and dust in space which led to the formation of the solar system.

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Read the sentences below in 1962, i tried to enroll as the first black student at the university of mississippi. the governor of mississippi blocked my entrance which best describes the verbs used in the sentences? o they are past tense verbs, which are often used in narrative essays o they are past tense verbs, which are not often used in narrative essays. o they are future tense verbs, which are often used in narrative essays o they are future tense verbs, which are not often used in narrative essays.

The answer is probably c. xylem