Which of the following statements is true? a. a producer usually obtains food by hunting other organisms. b. humans that prepare their own meals are producers. c. a producer must be a plant. d. consumers depend upon producers for food.

D. Consumers depend upon producers for food.

Explanation:

Consumers depend on producers for food because they can not make their own energy-rich molecules. They have to eat other organisms to obtain energy.

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.