What is heat? heat is the energy needed to change the temperature of 1 g of a substance by 1°c. heat is the average kinetic energy of the particles of a substance. heat is the total energy of a substance due to the movement of its particles. heat is the energy that flows between two substances of different temperatures.

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 .