The correct answer is: B. Biosphere
The biosphere is the part of Earth where living organisms can exist. It includes the land, water, and air, as well as the organisms that live in these areas. The biosphere is a dynamic system that is constantly changing. It is affected by the physical environment, such as climate and geology, as well as by the activities of living organisms.
The biosphere is divided into several different zones, based on the types of organisms that live there. The terrestrial zone includes the land and the atmosphere. The aquatic zone includes the oceans, lakes, and rivers. The soil zone includes the top layer of the Earth’s surface, where plants grow. The deep biosphere includes the parts of the Earth that are not directly affected by the sun’s energy, such as the deep ocean and the Earth’s crust.
The biosphere is a vital part of Earth’s ecosystem. It provides the resources that living organisms need to survive, such as food, water, and oxygen. It also helps to regulate the Earth’s climate. The biosphere is a fragile system, and it is important to protect it from damage.
The other options are incorrect because:
- The crust is the outermost layer of the Earth’s solid surface. It is made up of rocks and minerals.
- The exosphere is the outermost layer of the Earth’s atmosphere. It is very thin and contains very few molecules.
- The atmosphere is the layer of gases that surrounds the Earth. It is made up of nitrogen, oxygen, and other gases.