Which of the following correctly describes the flow of carbon in the carbon cycle? a. Air ---> animals ---> plants
b. Plants ---> animals ---> air
c. Air ---> fossil fuels ---> animals
d. Fossil fuels ---> plants ---> animals

(b) Plants ---> animals ---> air.

Since the cycle begins with the process of Photosynthesis as carbon dioxide is absorbed then becoming Carbon compounds. These are taken by primary consumers passed to secondary consumers then to tertiary consumers.

Then three processes takes place (respiration, Decomposition and Combustion) finally carbon dioxide is given out again.

I hope u understand.

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answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation: