Islam and the arabic language were first introduced to the people of north africa by a. traders from sub-saharan africa b. colonists from the united states c. armies from the middle east d. explorers from europe

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Which domain endings indicate websites that are most likely to be reliable sources? check all that apply. sites ending in .net

Some gamma ray bursts are hypothesized to come from mergers of neutron stars or black holes. if this hypothesis is correct, what else should we in principle be able to detect from such mergers? a. gravitiational waves b. x-ray bursts c. significant disruption of gas thousands of light-years away in the surrounding galaxy d. an "afterglow" of bright visible light, lasting for weeks