Green is green because it is the color that our eyes perceive when they detect light with a wavelength of around 520-570 nanometers. This wavelength falls within the visible spectrum of light, and when it is detected by the cones in our eyes, our brain interprets it as the color green. Objects appear green when they reflect or emit light in this specific wavelength range, which is why we perceive them as green. **

To preserve the green environment from drying out, it is important to conserve water by using it efficiently and avoiding wastage. Planting native and drought-resistant plants can help in maintaining the greenery without excessive water usage. Implementing rainwater harvesting systems and using organic mulch can also help in retaining moisture in the soil. Additionally, reducing the use of chemicals and pesticides can help in preserving the natural balance of the environment. **

Endurance performance in physical education class refers to the ability of an individual to sustain prolonged physical activity or exercise over an extended period of time. It involves the cardiovascular system's ability to deliver oxygen to the muscles efficiently, allowing the individual to maintain a steady level of physical exertion without becoming fatigued quickly. Endurance performance is often assessed through activities such as running, swimming, or cycling, where individuals are required to maintain a consistent level of effort for an extended duration. Developing endurance performance is important for overall fitness and can improve one's ability to participate in various physical activities and sports. **

Nature and species conservation refers to the protection and preservation of natural habitats and the various plant and animal species that inhabit them. This involves efforts to prevent the extinction of endangered species, restore and maintain healthy ecosystems, and minimize human impact on the environment. Conservation efforts can include creating protected areas, implementing sustainable resource management practices, and raising awareness about the importance of biodiversity. Ultimately, nature and species conservation aims to maintain the balance and diversity of life on Earth for the benefit of present and future generations. **

Sustainability in education refers to the integration of environmental, social, and economic principles into the learning experience. It involves teaching students about the importance of preserving natural resources, promoting social equity, and fostering economic prosperity for future generations. Sustainability in education also encompasses the development of critical thinking skills and a sense of responsibility towards the environment and society. It aims to empower students to become informed and active global citizens who can contribute to creating a more sustainable world. **

Cities should definitely include much more green spaces and nature. Green spaces provide numerous benefits such as improving air quality, reducing urban heat island effect, and promoting mental and physical well-being. Nature also helps to support biodiversity and create a more sustainable and resilient urban environment. By incorporating more green spaces and nature into cities, we can create healthier and more enjoyable living environments for residents. **

A substitute performance in physical education refers to an alternative activity or exercise that is provided to a student who is unable to participate in the regular physical education class due to a valid reason, such as injury or illness. The substitute performance is designed to ensure that the student can still engage in physical activity at a level that is safe and appropriate for their condition. It may involve modified exercises, individualized activities, or accommodations to meet the student's needs while still promoting their physical well-being. **

No, the physical education teacher does not only evaluate based on performance. While performance is an important aspect of physical education, the teacher also evaluates students on their effort, participation, attitude, and improvement. Additionally, the teacher may assess students on their knowledge of sports and fitness concepts, their ability to work well with others in team activities, and their adherence to safety guidelines. Overall, the evaluation in physical education is holistic and takes into account various aspects of a student's engagement and understanding of the subject. **