Question

which type of galaxy is made up of mostly new stars, usually smaller than other galaxies, has a lot of gas and dust, and its shape can be influenced by the gravity of other galaxies
options: irregular, elliptical, spiral, regular

Explanation:

Irregular galaxies are typically smaller, contain lots of gas and dust (which form new stars), and their shape is often influenced by gravitational interactions with other galaxies. Elliptical galaxies have older stars and little gas/dust. Spiral galaxies have a distinct spiral structure and are larger. "Regular" is not a standard galaxy classification type.

Answer:

Irregular (the top option labeled "Irregular")