Prediction: You are about to watch a video about a scientist who studies Jellies like the one shown in this image. One thing she investigates is
changes to the number of jellies living in an area What ideas do you have
about why the number of organisms in an area might increase?

The images show two species of tree frogs in a particular region. the gray tree frogs are adapted to the trees of the woodlands, while the green tree frogs can survive in woodlands or grasslands. the gray frog was abundant in the woodlands. because of climatic changes, most of the trees in the region died, and the woodlands changed to grasslands. in such a case, the . the gray tree frog is closely related to the green tree frog genetically, but they have different mating calls. this suggests that speciation occurred because of .