Several million people have migrated to the United States illegally in recent years. Why have most of these people come to the United States?
What will be an ideal response?
Answer: economic advancement
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Ionic bonds are found in calcite. What could this suggest about its physical properties?
A) It is bright white. B) It is malleable. C) It is a conductor of electricity. D) It is a softer mineral.
What is the atomic number of the element produced when an element with atomic number Z emits a positron?
A) Z __ 2 B) Z __ 1 C) Z + 1 D) Z + 2
How many electrons can be transported by a molecule of cytochrome c?
A) 1 B) 2 C) 3 D) 4
Carbon dioxide is a major factor in the global warming story since it
A. is present in the atmosphere in incredibly large quantity. B. creates its own heat through a poorly understood reaction. C. releases energy as a result of molecular decay. D. absorbs more infrared radiation than it emits.