Rattlesnake fern, or botrychium virginianum, as shown below, is a species of fern, a seedless plant, that is found all across north america. which structure is involved in the reproduction of this plant? spores pollen cones fruit

Competition occurs between species when

Compare the composition of the moon's surface with the composition of the earth's surface.

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