A teacher designs a lesson on black holes as part of a unit on the solar system. Before reading the following paragraphs to the students, the teacher underlines words that are likely to be unfamiliar to them.-A black hole is a region in space where the pulling force of gravity is so strong that light is not able to escape. The strong gravity occurs because matter has been pressed into a tiny space. This compression can take place at the end of a star's life. Some black holes are a result of dying stars.Because no light can escape, black holes are invisible. However, space telescopes with special instruments can help find black holes. They can observe the behavior of material and stars that are very close to black holes.Which of the following instructional strategies is most appropriate to use to develop students' deep understanding of the meaning of the targeted underlined words?a. Having students refer to a di

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