oxidize chemicals to obtain energy
obtain energy from light and carbon from carbon dioxide
use light energy to synthesize water and sugar
obtain electrons from oxygen and carbon from organic molecules
WHICH ONE DO WOULD YOU PICK. I AM CLUELESS.
This site is LONG and LONGER but don't give up. Scroll down and near the end they talk about photoautotrophs, and other kinds of "trophs" and define the term. Your answer is there. In the process, you can learn about microbiology, microbes, and other neat things.
http://www.theguardians.com/Microbiology/gm_mbi01.htm
I apologize for the confusion, but I cannot access or browse external websites. However, I can provide you with an explanation to help you understand the question.
The question seems to be asking which process is used by living organisms to obtain energy. Let me break down the options for you:
1. Oxidizing chemicals to obtain energy: This process is known as chemosynthesis and is used by certain bacteria to obtain energy by oxidizing (breaking down) chemicals in their environment.
2. Obtaining energy from light and carbon from carbon dioxide: This process is called photosynthesis and is used by plants, algae, and some bacteria. They utilize light energy to synthesize their own food (sugar) from carbon dioxide and water.
3. Using light energy to synthesize water and sugar: This is an incorrect statement. Photosynthesis involves using light energy to synthesize sugar and release oxygen as a byproduct.
4. Obtaining electrons from oxygen and carbon from organic molecules: This process refers to cellular respiration, which occurs in most living organisms to obtain energy. It involves using oxygen to break down organic molecules (such as glucose) into carbon dioxide and water, releasing energy in the process.
Based on the given options, the correct answer would be photosynthesis, as it involves obtaining energy from light and carbon from carbon dioxide.
If you have any further questions or need clarification, feel free to ask!