Dallon's theory states that atoms are the smallest possible parts of elements. in a chemical reaction ,atoms will
a.) rearrange and form new substances with new properties
b.) change form into completely new atoms with new properties
c.) be destroyed and remade into new substance.
d.) be turned completely into energy

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 .