Question

organisms use different processes to obtain the energy that they need to perform cellular functions.
which is used as an energy source by polar bears and orange trees?
sunlight
glucose
glycogen
starch

Explanation:

• Sunlight: Orange trees (plants) can use sunlight for photosynthesis to make glucose. But polar bears (animals) cannot use sunlight directly as an energy source.
• Glucose: Both plants (orange trees) and animals (polar bears) use glucose. Orange trees make glucose through photosynthesis and then can break it down (cellular respiration) for energy. Polar bears eat food (which contains nutrients that can be converted to glucose or used to make ATP, with glucose being a key intermediate in energy - related metabolic pathways).
• Glycogen: Glycogen is a storage form of glucose in animals (like polar bears). But orange trees store energy as starch (not glycogen).
• Starch: Starch is a storage form of glucose in plants (like orange trees). Polar bears do not use starch as a direct energy source; they break down the food they eat (which may have complex carbohydrates that are digested to simpler sugars like glucose).

Answer:

glucose