Will give brainliest

which statement is true?

spiral and elliptical galaxies have gas and dust between stars while irregular galaxies do not.
spiral and irregular galaxies have gas and dust between stars while elliptical galaxies do not.
irregular galaxies have gas and dust between stars while elliptical and spiral galaxies do not.
elliptical galaxies have gas and dust between stars while irregular and spiral galaxies do not.

Which of the following is true about the introduction of a non-native species to an environment? (a) they usually adapt quickly so they can have a positive affect on the environment. (b) they can disrupt the environment and cause much damage and devastation to native species. (c) they usually become predators in a food chain and to keep prey populations under control. (d) because the native species are better-adapted to the environment, the non-native species always end up dying out.