Which of the following is the original source of all energy used by nearly all organisms on earth? A. ATP B. Plants C. Heat D. The sun E. Water
The correct answer is D
The correct answer is D. The sun.
The sun is the original source of all energy used by nearly all organisms on earth. The sun emits electromagnetic radiation, primarily in the form of light and heat. Plants harness the energy from sunlight through a process called photosynthesis, in which they convert sunlight, carbon dioxide, and water into glucose and oxygen. This glucose serves as a source of energy for plants, and it is also used as a building block for the production of other organic compounds important for growth and development.
Other organisms, such as animals and fungi, obtain energy indirectly from the sun by consuming plants or plant-eating animals. This energy is then stored in the form of carbohydrates, such as sugars and starches, in their bodies. When these organisms break down these carbohydrates through cellular respiration, they release the stored energy in the form of ATP (adenosine triphosphate), which is a molecule that provides usable energy for cellular processes.
Therefore, while ATP is an important energy molecule used by organisms, it is not the original source of energy. It is derived from the energy captured by plants from sunlight through photosynthesis. Hence, the correct answer is D. The sun.
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