Here, I want to correct a wrong view of the landlord. Not all organisms that absorb carbon dioxide are autotrophs. Because autotrophs mean that they use natural energy, not bioenergy. Green plants absorb carbon dioxide, so carbon dioxide can only be said to be its "carbon source (to borrow microbial terms here)", sunlight is its energy, and sunlight belongs to natural energy, so plants belong to autotrophs. This does not mean that plants are autotrophs, because carbon dioxide is inorganic and plants absorb carbon dioxide. We don't know what its energy source is, except that its carbon source is carbon dioxide, so we can't say that it belongs to autotrophs unless we know that it uses light energy for photosynthesis or decomposes pyrite to reduce carbon dioxide into sugar. Given these conditions, we can judge whether it is an autotrophic organism.