Answer the following question given this paragraph: The first period of the Paleozoic Era was the Cambrian. By the beginning of the Paleozoic, organisms evolved shells. Shells could hold their soft tissues together. Shells could protect them from predators and from drying out. Some organisms evolved external skeletons. These are called exoskeletons . Organisms with hard parts also make good fossils. Fossils from the Cambrian are much more abundant than fossils from the Precambrian. Q: The first period of the paleozoic era was called what? Choices: - carboniferous - permian - ordovician - cambrian A:
cambrian
Answer the following question given this paragraph: Pressure is given in units of millimeters of mercury. We can either convert this to atmospheres or use the value of the ideal gas constant that includes the mmHg unit. We will take the second option. Substituting into the ideal gas law,. Q: What property of certain states of matter can be given in units of millimeters of mercury? Choices: - solvency - gravity - velocity - pressure A:
pressure
Q: Answer the following question given this paragraph: The most important way to keep your skin healthy is to protect it from ultraviolet light. Over-exposure to ultraviolet light can cause skin cancer. Keeping the skin clean can help prevent acne. Q: What is one major cause of skin cancer? Choices: - visible light - sunscreen - infrared light - ultraviolet light A:
A: ultraviolet light
Question: Answer the following question given this paragraph: milk of magnesia, pH = 10.5 2. pure water, pH = 7 3. wine, pH = 3.0. Q: What is the ph of pure water? Choices: - 5 - 4 - 2 - 7 A:
Answer: 7
*Question*
Answer the following question given this paragraph: Figure 14.3 The Tongue The tongue is covered with small bumps, called papillae, which contain taste buds that are sensitive to chemicals in ingested food or drink. Different types of papillae are found in different regions of the tongue. The taste buds contain specialized gustatory receptor cells that respond to chemical stimuli dissolved in the saliva. These receptor cells activate sensory neurons that are part of the facial and glossopharyngeal nerves. LM 1600. (Micrograph provided by the Regents of University of Michigan Medical School ©️ 2012). Q: What is the name of the small bumps that contain taste buds and covers the tongue? Choices: - lingual tonsils - palatine tonsils - cuticle - papillae A:
**Answer**
papillae
*Question*
Answer the following question given this paragraph: A third factor that affects the rate of dissolving is the size of solute particles. For a given amount of solute, smaller particles have greater surface area. With greater surface area, there can be more contact between particles of solute and solvent. For example, if you put granulated sugar in a glass of iced tea, it will dissolve more quickly than the same amount of sugar in a cube (see Figure below ). That's because all those tiny particles of granulated sugar have greater total surface area than a single sugar cube. Q: For a given amount of solute, do smaller particles have a greater or lesser surface area? Choices: - lesser - equal - neither - greater A:
**Answer**
greater