There isn't a single molecule which is metabolized to produce energy, since any organic compounds such as sugars, fats, or proteins may be used. However, the most common one is glucose sugar.
Layer D is the oldest because bottom layers form first and are covered by new rock layers.
<span>Because there is a lack of sufficient oxygen in muscle cells. For muscle cells to convert pyruvate into usable energy (ATP), there must be a sufficient amount of oxygen available to the cells. When there is not, the body has the ability to convert it to lactate which can provide energy when little oxygen is available.</span>
The wolf is a consumer. (secondary consumer specifically)
Consumer means the animals in a food chain which eats other animal / plant at a lower tropic level (position in food chain) for energy.
Detritivore are organisms that decomposes dead organic matter, and returning the broken down nutrients and matter back to the start of a food chain, which is for the producers.
Producers are usually green plants which make their own food from sunlight, by the process of photosynthesis, and we call the organisms that uses this kind of feeding (making food on their own) as autotroph.
Therefore, since the wolf feeds on rabbits for energy, and not carrying out photosynthesis nor decomposing other organisms for food, so the answer is consumer.
