Problem:OPTIONS:
- pores
- nostrils
- spores
- gills

Answer the following question given this paragraph: Q: Vertebrates lacking what structures often use lungs for gas exchange? A:
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A: gills

Problem:OPTIONS:
- regiments of matter
- battalions of matter
- depth of matter
- units of matter

Answer the following question given this paragraph: 29.4 Photon Momentum Measuring Photon Momentum The quantum of EM radiation we call a photon has properties analogous to those of particles we can see, such as grains of sand. A photon interacts as a unit in collisions or when absorbed, rather than as an extensive wave. Massive quanta, like electrons, also act like macroscopic particlessomething we expect, because they are the smallest units of matter. Particles carry momentum as well as energy. Despite photons having no mass, there has long been evidence that EM radiation carries momentum. (Maxwell and others who studied EM waves predicted that they would carry momentum. ) It is now a well-established fact that photons do have momentum. In fact, photon momentum is suggested by the photoelectric effect, where photons knock electrons out of a substance. Figure 29.17 shows macroscopic evidence of photon momentum. Q: Massive quanta, like electrons, also act like macroscopic particlessomething we expect, because they are the smallest what? A:
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A: units of matter

Problem:OPTIONS:
- electrons
- molecules
- protons
- nucleus

Answer the following question given this paragraph: Cell division is simpler in prokaryotes than eukaryotes because prokaryotic cells themselves are simpler. Prokaryotic cells have a single circular chromosome, no nucleus, and few other organelles. Eukaryotic cells, in contrast, have multiple chromosomes contained within a nucleus, and many other organelles. All of these cell parts must be duplicated and then separated when the cell divides. A chromosome is a molecule of DNA, and will be the focus of a subsequent concept. Q: What important organelle (that would otherwise be centrally located and crucial to the cell's survival) do prokaryotic cells lack? A:
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A: nucleus

Problem:OPTIONS:
- weight
- diameter
- height
- density

Answer the following question given this paragraph: As you know, density is defined as the mass per unit volume of a substance. Since gases all occupy the same volume on a per mole basis, the density of a particular gas is dependent on its molar mass. A gas with a small molar mass will have a lower density than a gas with a large molar mass. Gas densities are typically reported in g/L. Gas density can be calculated from molar mass and molar volume. Q: What is defined as the mass per unit volume of a substance? A:
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A:
density