Write 4 chemical equations with the product and reactant. (if you know only 1 or 2 just write it)

The answer for #3 is c but i don't know why

Based on the equation and the information in the table, what is the enthalpy of the reaction?

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.