The galaxies in the universe vary in age. Which type of galaxy will the oldest galaxy in the universe most likely be? *
A spiral galxy
O A nebular galaxy
O An elliptical galaxy
O An irregular galaxy

Competition occurs between species when

To determine if a particular plant is homozygous or heterozygous, you would have to test cross with a

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