Answer:
A
Explanation:
Energy is from the sun. The sunlight causes plants to grow. Sorry h avent done science is a while.
They can make food, help keep the environment clean, and make medicines.
<span>Both photoautotrophs and chemoautotrophs synthesize organic compounds from (inorganic) carbon dioxide, a process known as carbon fixation. Photoautotrophs get the energy to perform these reactions from light. Chemoautotrophs get it from electron donors such as hydrogen sulfide and ammonia. Cyanobacteria, by contrast, convert nitrogen from the atmosphere into ammonia, a process known as nitrogen fixation.</span>