Which phrase describes an irregular galaxy? O has a round shape
O does not have a specific shape
O has arms that extend from the center
O is larger than other types of galaxies

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere