Question: Q: What is formed when plant bodies are lithified? Choices: - copper - fossils - methane - coal A:
Answer: coal

Question: Q: What subphylum, which includes crabs and crayfish, represents the dominant aquatic arthropods? Choices: - arachnids - sponges - invertebrates - crustaceans A:
Answer: crustaceans

Question: Q: Living organisms are comprised of organic compounds, which are molecules built around what element? Choices: - oxygen - silicon - helium - carbon A:
Answer:
carbon