True or false questions: 1. when a cell is put into an isotonic solution, individual water molecules cannot move back and forth across the cell membrane. 2.when a cell is put into a hypertonic solution, there is a net movement of water molecules across the cell membrane into the cell.. 3.when a cell is put into a hypotonic solution, there is a net movement of water molecules across the cell membrane out of the cell. 4.the movement of any solvent across a semi-permeable membrane is called osmosis.

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 .