input: OPTIONS:
- graphite
- hydrogen
- oxygen
- carbon Now, answer this question: Answer the following question given this paragraph: Hardness helps determine how an element (especially a metal) might be used. Many elements are fairly soft (silver and gold, for example) while others (such as titanium, tungsten, and chromium) are much harder. Carbon is an interesting example of hardness. In graphite (the "lead" found in pencils) the carbon is very soft, while the carbon in a diamond is roughly seven times as hard. Q: Although they differ vastly in hardness, pencil lead and diamonds both contain what element? A:
A:
output: carbon

Answer the following question given this paragraph: The term theory is used differently in science than it is used in everyday language. A scientific theory is a broad explanation that is widely accepted because it is supported by a great deal of evidence. Because it is so well supported, a scientific theory has a very good chance of being a correct explanation for events in nature. Because it is a broad explanation, it can explain many observations and pieces of evidence. In other words, it can help connect and make sense of many phenomena in the natural world. Q: What allows theories to be widely accepted? A:

OPTIONS:
- hypothesis
- observation
- theory
- evidence

Answer: evidence

Problem: OPTIONS:
- ultraviolet light
- apparent light
- infrared light
- visible light
Q: Answer the following question given this paragraph: Describe hotspots and the volcanic activity they create. Q: What are the light wavelengths that the human eye can detect called? A:
Answer: visible light

Problem:OPTIONS:
- metabolism
- secretion
- expulsion
- respiration

Answer the following question given this paragraph: Respiration is the exchange of gases between the body and the outside air. Q: What is the exchange of gases between the body and outside air? A:
****
A: respiration

Answer the following question given this paragraph: Matter can exist in one of several different states, including a gas, liquid, or solid state. States of matter differ in the amount of energy their molecules have. When matter recycles, it changes state by gaining or losing energy. Q: When matter recycles and changes state what does it gain or lose by doing so? A:
OPTIONS:
- density
- volume
- fuel
- energy
energy

Answer the following question given this paragraph: Lactic acid fermentation converts the 3-carbon pyruvate to the 3-carbon lactic acid (C 3 H 6 O 3 ) (see Figure below ) and regenerates NAD + in the process, allowing glycolysis to continue to make ATP in low-oxygen conditions. Since there is a limited supply of NAD + available in any given cell, this electron acceptor must be regenerated to allow ATP production to continue. To achieve this, NADH donates its extra electrons to the pyruvate molecules, regenerating NAD + . Lactic acid is formed by the reduction of pyruvate. Q: What natural destructive element cuts away at rock forming river valleys? A:
OPTIONS:
- sediment
- lava
- air
- water

Answer:
water