Here are the answers to your questions:
Question 1:
Answer: splitting water into hydrogen and oxygen
Question 2:
Answer: usable form of energy.
Question 3:
Answer: Electron Transport Chain
Question 4:
Answer: Photosynthesis converts radiant energy to chemical energy to be used by organisms in the food chain.
Question 5:
Answer: bacteria
Question 6:
Answer: Energy flows in one direction, and matter cycles through the environment.
Question 7:
Answer: Food webs are the best depictions of feeding relationships because they show many ways that plants and animals are connected.
Question 8:
Answer: glucose molecules.
Question 9:
Answer: Stored chemical energy is broken down and released in the mitochondria.
Question 10:
Answer: carnivore
Question 11:
Answer: Energy decreases at each level, and only 10% remains from the previous level.
Question 12:
Answer: Consumers are organisms that eat other organisms. Producers are organisms that make their own food using the energy from the sun.
Question 13:
Answer: producer
Question 14:
Answer: decrease.
Question 15:
Answer: omnivores
Question 16:
Answer: 0.1%
Question 17:
Answer: plants.
Question 18:
Answer: fungus
Question 19:
Answer: grass → rabbit → snake → hawk
Question 20:
Answer: corn
Feel free to ask if you have any more questions or need further clarification!