Answer the following question given this paragraph: Natural selection occurs when there are differences in fitness among members of a population. As a result, some individuals pass more genes to the next generation. This causes allele frequencies to change. Q: What occurs when there are differences in fitness among a population? Choices: - evolution - natural process - natural change - natural selection A:
natural selection
Answer the following question given this paragraph: This same logic explains the behavior of gyroscopes. Figure 10.31 shows the two forces acting on a spinning gyroscope. The torque produced is perpendicular to the angular momentum, thus the direction of the torque is changed, but not its magnitude. The gyroscope precesses around a vertical axis, since the torque is always horizontal and perpendicular to L . If the gyroscope is not spinning, it acquires angular momentum in the direction of the torque ( L falling over just as we would expect. Q: If a gyroscope is not spinning, it acquires angular momentum in the direction of what? Choices: - gravity - acceleration - velocity - torque A:
torque
Q: Answer the following question given this paragraph: The fluoride ion is acting as a weak Brnsted-Lowry base. The hydroxide ion that is produced as a result of the above reaction makes the solution slightly basic. Salt hydrolysis is a reaction in which one of the ions from a salt reacts with water, forming either an acidic or basic solution. Q: Salt hydrolysis is a reaction in which one of the ions from a salt reacts with what? Choices: - proteins - fat - air - water A:
A: water
Question: Answer the following question given this paragraph: The Precambrian Supereon (4.6 billion544 million years ago) is the first major division of the geologic time scale. The first living cells may have evolved around 4 billion years ago. By 1 million years ago, the first multicellular eukaryotes had evolved. The Precambrian ended with the first of six mass extinctions that occurred during Earth's history. Q: The first living cells may have evolved around how long ago? Choices: - 900,000 years - 6 billion years - 2.2 billion years - 4 billion years A:
Answer: 4 billion years
*Question*
Answer the following question given this paragraph: The ozone in smog may damage plants. The effects of ozone add up over time. Plants such as trees, which normally live a long time, are most affected. Entire forests may die out if ozone levels are very high. Other plants, including crop plants, may also be damaged by ozone. You can see evidence of ozone damage in Figure below . Q: What is the term for the gas in smog that can damage plants? Choices: - dioxide - carbon - sulphur - ozone A:
**Answer**
ozone
Answer the following question given this paragraph: Discussion As might have been expected, the player slides a shorter distance by sliding uphill. Note that the problem could also have been solved in terms of the forces directly and the work energy theorem, instead of using the potential energy. This method would have required combining the normal force and force of gravity vectors, which no longer cancel each other because they point in different directions, and friction, to find the net force. You could then use the net force and the net work to find the distance d that reduces the kinetic energy to zero. By applying conservation of energy and using the potential energy instead, we need only consider the gravitational potential energy. Q: What force increases a slide downhill and decreases a slide uphill? Choices: - nuclear - frictional - tension - gravity A:
gravity