We breath oxygen because it is needed to burn fuel [ sugars and fatty acids] in our cells to produce energy. Oxygen is also brought into the lungs via breathing; where it is transported by red blood cells to the entire body to be used to produce energy. The food we eat gives us protein, sugars, vitamins etc. for energy
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The answer is a ‘series of steps in which enzymes work one
at a time to convert a compound to a related compound’. The intermediate products of metabolic pathways are called metabolites. An example of a metabolic cycle is the Glycolysis and Krebs cycles. The product in each step of the
metabolic pathways becomes the substrate
of the next step in the pathway. There are two types of metabolic pathways;
anabolic and catabolic
No abiotic things are non-living, and cells are living.
Trophic cascades are interactions with much power that control an entire ecosystem when suppressed