Use public transport, cycle or walk instead of using a car. Use facilities and trips run by local people whenever possible. Don't be tempted to touch wildlife and disturb habitats whether on land, at the coast or under water.
As the volume increases, there is more space so the average distance between the gas molecules also increases.
Letters A and B are correct because burning fossil fuels can harm the atmosphere through the greenhouse effect and contribute to global warming, and can sometimes spill into the water and harm the environment.
I wanna say false, but I’m sorry if I’m wrong :(
