The word anabolism refers to constructive, buildup, or synthesis reactions while the word catabolism refers to destructive, breakdown, or digestive reactions. What does it mean to say that in a cell, catabolism fuels anabolism?

Anabolic reactions need energy.

Explanation:

Anabolic reactions (like the build up of fatty acids) are active processes and need energy. Catabolic processes like respiration will provide the ATP required to build up macromolecules. Thus, catabolism fuels anabolism.

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he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?