R indicates round seeds that are dominant over the wrinkled variety represented by R for each numbered individual in the pedigree give the genotype and the phenotype.

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.