The correct answer is: C. 5-10 km above the earth’s surface.
The biosphere is the part of Earth where life exists. It includes the land, water, and air, as well as the organisms that live in these areas. The biosphere is a thin layer that surrounds the Earth, and it is constantly changing.
The thickness of the biosphere varies depending on the definition used. Some scientists define the biosphere as the part of Earth where life can exist, while others define it as the part of Earth where life does exist. The thickness of the biosphere is also affected by the presence of water. Water is essential for life, and it is found in the atmosphere, on the land, and in the oceans. The thickness of the biosphere is therefore greater in areas where there is more water.
The biosphere is a dynamic system that is constantly changing. The Earth’s climate is changing, and this is affecting the biosphere. The biosphere is also affected by human activities, such as pollution and deforestation. These activities are causing the biosphere to shrink, and they are also causing the biosphere to become more polluted.
The biosphere is a vital part of Earth, and it is important to protect it. We need to reduce pollution and deforestation, and we need to find ways to adapt to climate change. We also need to learn more about the biosphere, so that we can better understand how it works and how we can protect it.
The other options are incorrect because they do not accurately reflect the thickness of the biosphere. Option A is too high, and option B is too low. Option D is also too high, and it is not supported by scientific evidence.