Q: Compounds that contain mainly the elements carbon and hydrogen are called what kind of compounds? Read this paragraph and choose the correct option from the provided answers: Compounds that contain mainly the elements carbon and hydrogen are called organic compounds . This is because they are found mainly in living organisms. Most organic compounds are held together by covalent bonds. An example of an organic compound is glucose (C 6 H 12 O 6 ), which is shown in Figure below . Glucose is a simple sugar that living cells use for energy. All other compounds are called inorganic compounds. Water is an example of an inorganic compound. Choices: - microscopic compounds - reactive compounds - natural compounds - organic compounds A:
organic compounds

Q: The way in which the sun produces light is called what? Read this paragraph and choose the correct option from the provided answers: Most of the visible light on Earth comes from the sun. The sun and other stars produce light because they are so hot. They glow with light due to their extremely high temperatures. This way of producing light is called incandescence . Incandescent light bulbs also produce light in this way. When electric current passes through a wire filament inside an incandescent bulb, the wire gets so hot that it glows. Do you see the glowing filament inside the incandescent light bulb in the Figure below ?. Choices: - tumescence - rays - photosynthesis - incandescence A:
incandescence

Q: A _______ of biology is a fundamental concept that is just as true for a bee or a sunflower as it is for us. Read this paragraph and choose the correct option from the provided answers: The word principle can be defined as "a fundamental truth or proposition that serves as the foundation for a system of belief or behavior or for a chain of reasoning. " A principle of biology is a fundamental concept that is just as true for a bee or a sunflower as it is for us. All life, including that sunflower and bee, is made of at least one cell. The traits of a particular organism are embedded within its genes, that organism must maintain homeostasis to survive, and that organism has evolved from previously existing species. Choices: - hypothesis - theory - notion - principle A:
principle