Darwinism designates a distinctive form of evolutionary explanation for the history and diversity of life on earth. Its original formulation is provided in the first edition of On the Origin of Species in 1859.
The enthalpy - or internal energy - of a substance is a function of its temperature and pressure. The change in internal energy with respect to change in temperature at fixed pressure is the Specific Heat at constant pressure - cp.
First of all, enthalpy is a state function, meaning that its value is fixed when temperature, pressure, composition, and physical form are specified. Second, at a constant pressure, DH = q, meaning that at constant pressure, the enthalpy of a system is equal to the heat, in joules, of a system.