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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When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection

Which of these is true of the cytoplasm of an unfertilized egg? a. it is an unevenly distributed mixture of mrna, proteins, organelles, and other substances. b. it does not contain substances that are important in directing development. c. these substances are supplied by the sperm. d. it does not contain substances that are important in directing development. e. development is directed solely by the surrounding cells. f. it is a homogeneous mixture of mrna, proteins, organelles, and other substances. g. it does not contain substances that are important in directing development. h. these substances are produced by the dna of the fertilized zygote.

The means by which a cell transports large molecules out of the cell is called