Answer the following question given this paragraph: Use an electron microscope. This instrument has a resolution many times greater than a light microscope, and can be used to see the details on the outside of a cell. Some electron microscopes can also be used to see the details inside a cell. Q: What instrument has a resolution many times greater than a light microscope, and can be used to see the details on the outside of a cell? Choices: - complex microscope - element microscope - molecular microscope - electron microscope A:
electron microscope

Answer the following question given this paragraph: Internal Energy U We can think about the internal energy of a system in two different but consistent ways. The first is the atomic and molecular view, which examines the system on the atomic and molecular scale. The internal energy U of a system is the sum of the kinetic and potential energies of its atoms and molecules. Recall that kinetic plus potential energy is called mechanical energy. Thus internal energy is the sum of atomic and molecular mechanical energy. Because it is impossible to keep track of all individual atoms and molecules, we must deal with averages and distributions. A second way to view the internal energy of a system is in terms of its macroscopic characteristics, which are very similar to atomic and molecular average values. Macroscopically, we define the change in internal energy. Q: What type of energy of a system is the sum of the kinetic and potential energies of its atoms and molecules? Choices: - external energy u - primary energy u - deep energy u - internal energy u A:
internal energy u

Answer the following question given this paragraph: Astronomers use many tools to study things in space. Earth-orbiting telescopes view stars and galaxies from the darkness of space ( Figure below ). They may have optical and radio telescopes to see things that the human eye can't see. Spacecraft travel great distances to send back information on faraway places. Q: What type of scientist uses earth-orbiting telescopes? Choices: - astrologer - biologist - anthropologist - astronomer A:
astronomer

Answer the following question given this paragraph: Q: What does the armor including spines in some species offer? Choices: - nutrition - protection from cold - energy - protection from predators A:
protection from predators