Select the correct answer from the list.(1 point)

gravity; collapse

To form a nebula, gravity pulls matter together or causes condensation.

To answer this question, you need to understand the concept of nebula formation. A nebula is a large, diffuse cloud of gas and dust in space. There are different types of nebulae, but they generally form through the gravitational collapse of interstellar gas.

Now, let's analyze the options given:

1. Gravity
2. Fusion
3. Radiation
4. Plate Tectonics

Based on the explanation above, the correct answer would be option 1: Gravity. Gravity is responsible for pulling matter together and causing it to collapse, leading to the formation of a nebula. So, select "Gravity" as the correct answer.