Which feature is used to classify galaxies? age, color ,shape, size wich one need asap

The correct answer is Shape.

Explanation:

Galaxies are defined as the system of million or billions of stars along with gas and dust held together by gravitational attraction.

These are classified as 3 types on the basis of its shape:

1. Spiral galaxy: It is defined as the galaxy in which stars and gas clouds are located mainly in one or more spiral arms. Example: Milky Way

2. Elliptical galaxy: It is defined as the galaxy which has ellipsoidal shape and a smooth, featureless image. Example: M-110.

3. Irregular galaxy: It is defined as the galaxy that does not have any distinct regular shape. Example: Irr-I galaxy.

Hence, the correct answer is Shape.

hope this

explanation:

covalent bonds

consist of pairs of electrons shared by two atoms, and bind the atoms to fixed orientation and requre high energies to break them

ionic bonds

when two atoms differ considerably in their electronegativity, then one of the atoms will lose its electron to the other atom. this results in a positively charged ion(cation) and a negatively charged ion (anion)