Problem: 
Q: Answer the following question given this paragraph:   The organs of the excretory system are also parts of other organ systems. For example, your lungs are part of the respiratory system. Your lungs remove carbon dioxide from your body, so they are also part of the excretory system. More organs of the excretory system are listed below ( Table below ).   Q: What two systems are the lungs part of?   A:
Answer: respiratory and excretory
Problem: 
Q: Answer the following question given this paragraph:   Hydrocarbons vary greatly in size, which influences properties such as melting and boiling points. At room temperature, hydrocarbons may be gases, liquids, or solids. They are generally nonpolar and do not dissolve in water.   Q: What type of carbons may be gases, liquids, or solids at room temperature?   A:
Answer: hydrocarbons
Problem: 
Q: Answer the following question given this paragraph:   The Sun is Earth’s main source of energy. The Sun gives us both light and heat. The Sun changes hydrogen into helium through nuclear fusion. This releases huge amounts of energy. The energy travels to the Earth mostly as visible light. The energy is carried through the empty space by radiation . We can use sunlight as an energy resource, called solar energy ( Figure above ).   Q: What is earth's main source of energy?   A:
Answer:
the sun