Which of the following galaxies do not have a regular structure? a. spiral galaxies b. elliptical and barred spiral galaxies c. irregular galaxies d. irregular and elliptical galaxies

Correct answer is C. Irregular galaxies

Explanation:

An irregular galaxy is a galaxy which does not have a well-defined structure and is not identical to an elliptical or a spiral galaxy. Irregular galaxies do not fall into any class of the galaxies having a distinct size and shape.

These galaxies are rich in dust and gas and do not have a smooth appearance. They appear rough and chaotic in structure when observed through a telescope.  Furthermore, these are the type of galaxies which are still not fully understood by the astronauts.

the most common type of reef is the fringing reef. this type of reef grows seaward directly from the shore. they form borders along the shoreline and surrounding islands.

well, i believe that the answer is 2. : 3