*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? Choices: - graphite - hydrogen - oxygen - carbon A:
**Answer**
carbon

*Question*
Answer the following question given this paragraph: Radioactivity is the ability of an atom to emit, or give off, charged particles and energy from the nucleus. The charged particles and energy are called by the general term radiation . Only unstable nuclei emit radiation. When they do, they gain or lose protons. Then the atoms become different elements. (Be careful not to confuse this radiation with electromagnetic radiation, which has to do with the light given off by atoms as they absorb and then emit energy. ). Q: What is the ability of an atom to emit, or give off, charged particles and energy from the nucleus? Choices: - magnetism - electrolysis - electromagnetism - radioactivity A:
**Answer**
radioactivity

*Question*
Answer the following question given this paragraph: Evolution occurs as organisms acquire and pass on new traits from one generation to the next generation. Its occurrence over large stretches of time explains the origin of new species and the great diversity of the biological world. Extant species are related to each other through common descent, and products of evolution over billions of years. Analysis of the DNA of different organisms indicates there is a similarity among very different organisms in the genetic code that help make proteins and other molecules. This genetic code is used by all known forms of life on Earth. The theory of evolution suggests that the genetic code was established very early in the history of life, and some studies suggest it was established soon after the formation of Earth. The timeline of the evolution of life, shown in Figure below , outlines the major events in the development of life. Q: What occurs when organisms acquire and pass on new traits from one generation to the next generation? Choices: - variation - birth - phenomenon - evolution A:
**Answer**
evolution

*Question*
Answer the following question given this paragraph: The diaphragm is a sheet of muscle that spreads across the bottom of the rib cage. When the diaphragm contracts, the chest volume gets larger, and the lungs take in air. When the diaphragm relaxes, the chest volume gets smaller, and air is pushed out of the lungs. Q: What is a sheet of muscle that spreads across the bottom of the rib cage? Choices: - cartilage - thorax - diagram - diaphragm A:
**Answer**
diaphragm