Q: What are all scientific explanations and interpretations based on? Choices: - changes - theories - controls - facts A:
facts

Q: What type of gases trap heat in the atmosphere, causing earth to have a moderate temperature? Choices: - ozone gases - carbon monoxides - sulfuric gases - greenhouse gases A:
greenhouse gases

Q: Q: Organic compounds are defined as covalently bonded compounds containing carbon, excluding carbonates and what else? Choices: - gases - crystals - acids - oxides A:
A: oxides

Question: Q: Vitamins are organic compounds that are essential in very small amounts for the maintenance of normal what? Choices: - respiration - pigments - calcium - metabolism A:
Answer: metabolism

*Question*
Q: What is the protein that carries iron that binds with oxygen in red blood cells? Choices: - keratin - potassium - insulin - hemoglobin A:
**Answer**
hemoglobin

*Question*
Q: What is a diagram that shows a single way that energy flows throughout an ecosystem? Choices: - fuel chain - dependent chain - water cycle - food chain A:
**Answer**
food chain