Select the correct answer. Which of the following is one of the most significant reasons cogeneration is not widely used?
OA.
It is less efficient than conventional methods of producing energy.
O B.
Biofuels are new, and people are reluctant to use them.
O C.
Thermal energy is not useful like electricity is.
OD.
It requires cost-prohibitive equipment upgrades.
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Which term refers to the total dollar value of the goods and services produced in a country in a year?

What sentence best supports the statement that hormones are involved in the regulation of homeostasis? a. the hormone erythropoeitin increases the production of red blood cells when oxygen levels are low. b. the hormone oxytocin promotes labor contractions of the uterus during childbirth. c. the hormone melatonin induces sleep and its production is slowed by exposure to light. d. the hormone cortisol suppresses the immune system and is produced when the body is under stress.

When a human or animal consumes food, the carbon in that food is most likely to be converted into which of the following elements? a. carbon remains carbon b. nitrogen c. oxygen d. hydrogen