answer:Here's a revised version of the text, condensed to around 100 words: Public transportation significantly reduces greenhouse gas emissions by decreasing the number of vehicles on the road. In the United States, transportation emissions account for nearly 30% of total greenhouse gas emissions, primarily due to private cars. By taking public transportation, individuals can reduce their carbon dioxide emissions by over 4,800 pounds per year. Public transportation also cuts emissions of pollutants that contribute to poor air quality and health problems like asthma. Furthermore, it mitigates habitat fragmentation and stormwater runoff associated with new road construction. By promoting sustainable transportation, public transportation plays a crucial role in preserving the environment.

answer:When editing the 150-word version down to 100 words, I focused on preserving the essential information and ideas while eliminating redundant or secondary details. Here's a breakdown of the specific changes I made: 1. I removed the introductory sentence The benefits of public transportation on the environment are numerous as it's implied by the rest of the text and doesn't add significant value. 2. I condensed the information about greenhouse gas emissions and transportation into a single sentence, making it more concise and direct. 3. I kept the statistic about reducing carbon dioxide emissions by 4,800 pounds per year, as it provides a concrete example of the benefits of public transportation. 4. I merged the information about public transportation reducing emissions of other pollutants and its impact on air quality into a single sentence, making it more efficient. 5. I removed the second-to-last sentence By reducing the number of vehicles on the road, public transportation plays a crucial role in preserving the environment and promoting sustainable transportation as it's somewhat redundant with the rest of the text. Instead, I incorporated the idea of promoting sustainable transportation into the final sentence. 6. I rephrased the final sentence to make it more concise and focused on the core message, while maintaining the essential idea that public transportation is beneficial for the environment. Throughout the editing process, I aimed to preserve the key points and ideas while streamlining the language to make it more concise and effective.

answer:To find the greatest prime factor of 210, we first perform the prime factorization of the number. 1. Begin by determining if 2, the smallest prime number, is a factor of 210: 210 div 2 = 105 So, 2 is a factor. 2. Next, check for divisibility by 3: 105 div 3 = 35 Thus, 3 is a factor. 3. Now, check for divisibility by 5: 35 div 5 = 7 This shows 5 is a factor. 4. Finally, check if 7 is a prime number (which it is), and since 7 divides 35 exactly: 7 div 7 = 1 Hence, 7 is a factor. So, the prime factorization of 210 is: 210 = 2 times 3 times 5 times 7 The greatest of these prime numbers is boxed{7}.

answer:Graphene, a single layer of carbon atoms arranged in a two-dimensional honeycomb lattice, possesses several electronic properties that make it a promising material for use in electronic devices. Some of these properties include: 1. High electron mobility: Graphene has an exceptionally high electron mobility, which means that electrons can move through the material with minimal resistance. This property allows for faster and more efficient electronic devices, as electrons can travel at speeds of up to 200,000 cm2/Vs, much faster than in traditional semiconductors like silicon. 2. Zero bandgap: Graphene is a zero-bandgap semiconductor, meaning that its conduction and valence bands touch at the Dirac points. This property allows for continuous tunability of its electronic properties, making it suitable for various applications, including transistors and sensors. 3. High thermal conductivity: Graphene has excellent thermal conductivity, which helps in dissipating heat generated by electronic devices. This property can improve the performance and reliability of electronic devices by preventing overheating. 4. High mechanical strength: Graphene is incredibly strong and flexible, with a tensile strength of over 130 gigapascals. This property makes it an ideal material for use in flexible electronics and wearable devices. 5. Optical transparency: Graphene is highly transparent, absorbing only about 2.3% of visible light. This property makes it suitable for use in transparent electronics, such as touchscreens and solar cells. 6. Large surface area: Graphene has a large surface area, which can be beneficial for applications like energy storage and sensors, as it allows for more efficient interactions with other materials. 7. Quantum Hall effect: Graphene exhibits the quantum Hall effect even at room temperature, which is a unique property that can be exploited for use in quantum computing and other advanced electronic devices. These electronic properties make graphene a promising material for a wide range of applications, including high-speed transistors, flexible electronics, transparent conductive coatings, energy storage devices, and sensors.