input: OPTIONS:
- oxygen gradient
- speed gradient
- solution gradient
- temperature gradient Now, answer this question: Answer the following question given this paragraph: Air temperature changes with altitude. This does not occur in the same way as pressure and density, which decrease with altitude. Changes in air temperature are not regular. A change in temperature with distance is called a temperature gradient . Q: A change in temperature with distance is called a what? A:
A:
output: temperature gradient

Answer the following question given this paragraph: Ground tissue makes up most of the interior of a plant. It carries out basic metabolic functions and stores food and water. Q: What makes up most of the interior of a plant? A:

OPTIONS:
- conjunction tissue
- support tissue
- transport tissue
- ground tissue

Answer: ground tissue

Problem: OPTIONS:
- crystal regia
- acidus regia
- sulfate regia
- aqua regia
Q: Answer the following question given this paragraph: Aqua regia, a mixture of nitric acid and hydrochloric acid, is one of the few materials that will dissolve gold. This material, translated to "royal water" in English, was named so because it could dissolve the royal metal gold. First noted in the fourteenth century, aqua regia could be used to help ascertain whether a particular material was actually gold or was some trickery of the alchemist. Nitric acid by itself will not dissolve gold, but will in combination with hydrochloric acid. The chemistry of the process is rather complex, with both acids reacting with the metal to form soluble gold compounds. The gold can be recovered from the solution, making the process useful for purification purposes. Q: What a mixture of nitric acid and hydrochloric acid? A:
Answer: aqua regia

Problem:OPTIONS:
- gravitational
- astronomical
- biological
- physical

Answer the following question given this paragraph: Physical properties describe the existence of matter, and chemical properties describe how substances change into other substances. Q: What properties describe the existence of matter, as opposed to chemical properties that describe how substances change into other substances? A:
****
A: physical

Answer the following question given this paragraph: Q: What element is essential for amino acid and nucleic acid production? A:
OPTIONS:
- oxygen
- carbon
- hydrogen
- nitrogen
nitrogen

Answer the following question given this paragraph: Biotic factors are all of the living or once-living aspects of the environment. They include all the organisms that live there as well as the remains of dead organisms. Q: What are all of the living or once-living aspects of the environment called? A:
OPTIONS:
- abiotic factors
- photic factors
- fossils
- biotic factors

Answer:
biotic factors