Question

which type of galaxy has arms that contain stars in various stages of formation and show signs of star - birth activity? elliptical irregular barred spiral normal spiral

Explanation:

Spiral galaxies have arms. Normal spiral galaxies have arms that contain stars in various stages of formation and young stars. Elliptical galaxies are smooth and lack distinct arms with star - forming regions. Irregular galaxies have no defined shape and are not characterized by arms with star - forming regions like spiral galaxies. Barred spiral galaxies have a bar - shaped structure in the center and their arms also contain stars in different stages of formation, but the question doesn't specifically point to the bar feature. So the most general type fitting the description of arms with star - forming regions is the normal spiral.

Answer:

D. normal spiral