How are the limbs of the frog, whale, horse, lion, human, bat, and bird the same ?

Their limbs are homologous structures, which means that they are all inherited from the common ancestor of the tetra pods. 

Atransverse wave (lowest wave) and a the transverse  wave's wavelength .

A  reaction  in which  energy  is  released  to the surroundings is called an exothermic  reaction. in this type of  reaction  the enthalpy, or stored  chemical energy, is lower for the products than the reactants. when ammonium nitrate is dissolved in water,  energyis  absorbed  and the water cools.