Answer the following question given this paragraph: Acids are molecular compounds that dissolve in water to produce hydronium ions and an anion. Q: Acids are molecular compounds that dissolve in water to produce hydronium ions and what else? Choices: - a neutron - a proton - an alkali - an anion A:
an anion
Answer the following question given this paragraph: The generation of an isolated but open system, which we might call a protocell, was a critical step in the origin of life. Such an isolated system has important properties that are likely to have facilitated the further development of life. For example, because of the membrane boundary, changes that occur within one such structure will not be shared with neighboring systems. Rather, they accumulated in, and favor the survival of, one system over its neighbors. Such systems can also reproduce in a crude way by fragmentation. If changes within one such system improved its stability, its ability to accumulate resources, or its ability to survive and reproduce, that system, and its progeny, would be likely to become more common. As these changes accumulate and are passed from parent to offspring, the organisms will inevitably evolve, as we will see in detail in the next chapter. As in living systems today, the earliest steps in the formation of the first organisms required a source of energy to maintain the non-equilibrium living system. There are really two choices for the source of this energy, either light (electromagnetic radiation from the sun) or thermodynamically unstable chemicals present in the environment. There have been a number of plausible scenarios, based on various observations, for the steps leading to life. For example, a recent study based on the analysis of the genes (and the proteins that they encode) found in modern organisms, suggests that the last universal common ancestor (LUCA) arose in association with hydrothermal vents.60 But whether this reflects LUCA or an ancestor of LUCA that became adapted to living is association with hydrothermal vents is difficult (and perhaps impossible) to resolve unambiguously, particularly since LUCA lived ~3.4-3.8 billion years ago and cannot be studied directly. Mapping the history of life on earth Assuming, as seems likely, that life arose spontaneously, we can now look at what we know about the fossil record to better understand the diversification of... Q: What is the theoretical event that began the universe often called? Choices: - Coreolis effect - dark matter - string theory - big bang A:
big bang
Q: Answer the following question given this paragraph: Head hair protects the scalp from ultraviolet light exposure and loss of body heat. Hair in eyelashes, eyebrows, and nostrils traps water, dust, and other irritants. Nails protect the ends of fingers and toes and enhance the sense of touch. Q: What protects the scalp from ultraviolet light exposure and loss of body heat? Choices: - ground hair - temporal hair - receding hair - head hair A:
A: head hair
Question: Answer the following question given this paragraph: Another name for this compound iswater. Water can create some absolutely beautiful sights. Iguassu Falls is the largest series of waterfalls on the planet, located in Brazil, Argentina, and Paraguay. And water is necessary for life. Water, like carbon, has a special role in biology because of its importance to organisms. Water is essential to all known forms of life. Water, H 2 O, such a simple molecule, yet it is this simplicity that gives water its unique properties and explains why water is so vital for life. Q: Which waterfall series is the largest on the planet? Choices: - yosemite falls - angel falls - niagara falls - iguassu falls A:
Answer: iguassu falls
*Question*
Answer the following question given this paragraph: Jellyfish spend most of their lives as medusae. They live virtually everywhere in the ocean. They prey on zooplankton, other invertebrates, and the eggs and larvae of fish. Q: What type of animal in the sea spend most of their lives as medusae? Choices: - fish - sharks - whales - jellyfish A:
**Answer**
jellyfish
(Q).
Answer the following question given this paragraph: Check Your Learning Ammonia can be liquefied by compression at room temperature; oxygen cannot be liquefied under these conditions. Why do the two gases exhibit different behavior? Answer: The critical temperature of ammonia is 405.5 K, which is higher than room temperature. The critical temperature of oxygen is below room temperature; thus oxygen cannot be liquefied at room temperature. Q: Unlike ammonia, oxygen cannot be liquefied at room temperature because its what is below room temperature? Choices: - relaxed temperature - leading temperature - particular temperature - critical temperature A:
(A).
critical temperature