Pathways provide the building blocks and the energy needed for .
a. metabolic, catabolic
b. catabolic, metabolic
c. anabolic, catabolic
d. catabolic, anabolic

c. Anabolic, catabolic  

Explanation:

Metabolism is the set of all biochemical reactions that occur in the body, divided into two forms: anabolism and catabolism.

Catabolism encompasses all reactions in which complex organic compounds are converted to simpler, energy-releasing molecules. Catabolism boils down to degradation or breakdown reactions of complex molecules, where it provides building blocks and energy for anabolism.

Anabolism comprises the reactions that form complex molecules from simpler, energy-consuming ones that were provided by catabolism. In short, anabolism is the set of reactions of synthesis or construction with the "blocks" provided by catabolism.

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a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.