Imagine a place where it rains every day. Tall trees loom above you. Branches form a green ceiling high in the sky. Plants, vines, and brightly colored flowers fill every inch of space. You are in a Costa Rican tropical rain forest. Rain forests fringe the low lying areas of the Caribbean and Pacific coasts. Costa Rica lies close to the equator, which means that temperatures stay warm—around 80 degrees—all year.

Using context clues in the passage, what is the meaning of loom?
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a group of branches and vines
to form a protective barrier
to be green and brown
to appear large and overwhelming

to appear large and overwhelming