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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OD it requires cost-prohibitive equipment upgrades.

Explanation:

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i think OB. i think goggle can answer it

1.A tissue is a collection of similar cells that work together to perform a specific job.

An organ is a collection of different tissues that work together to perform a specific job. The function of a part of an organism is what it actually does (it's job)

2.The structure of the alveoli as a web of blood vessels surrounding an air sac allows blood cells take in oxygen and bring it into the lungs (organ)