Question: Answer the following question given this paragraph:   When ancient plants underwent photosynthesis, they changed energy in sunlight to stored chemical energy in food. The plants used the food and so did the organisms that ate the plants. After the plants and other organisms died, their remains gradually changed to fossil fuels as they were covered and compressed by layers of sediments. Petroleum and natural gas formed from ocean organisms and are found together. Coal formed from giant tree ferns and other swamp plants.   Q: During photosynthesis what organelle is used by plants to change sunlight into chemical energy?   Choices:  - mitochondria  - golgi apparatus  - ribosome  - chloroplasts  A:
Answer: chloroplasts

Question: Answer the following question given this paragraph:   Solution 1. Saltwater acts as if it were a single substance even though it contains two substances—salt and water. Saltwater is a homogeneous mixture, or a solution. Soil is composed of small pieces of a variety of materials, so it is a heterogeneous mixture. Water is a substance; more specifically, because water is composed of hydrogen and oxygen, it is a compound. Oxygen, a substance, is an element.   Q: Saltwater is a homogeneous mixture, another term for what?   Choices:  - structure  - element  - lipid  - solution  A:
Answer: solution

Question: Answer the following question given this paragraph:   Internal energy—the sum of the kinetic and potential energies of a system’s atoms and molecules. Can be divided into many subcategories, such as thermal and chemical energy. Depends only on the state of a system (such as its P , V , and T ), not on how the energy entered the system. Change in internal energy is path independent.   Q: The sum of the kinetic and potential energies of a system’s atoms and molecules is called what?   Choices:  - mechanical energy  - used energy  - stored energy  - internal energy  A:
Answer:
internal energy