The correct answer is C. biosphere.
The biosphere is the part of Earth where life exists. It includes the land, water, and air, as well as all the organisms that live in these areas. The biosphere is a dynamic system that is constantly changing. It is affected by the Earth’s climate, geology, and biology.
The biosphere is divided into several different zones, based on the type of life that exists in each zone. The terrestrial biosphere includes all the land on Earth, from the poles to the equator. The aquatic biosphere includes all the water on Earth, from the oceans to the lakes and rivers. The atmospheric biosphere includes the air around Earth.
The biosphere is essential for life on Earth. It provides the air we breathe, the water we drink, and the food we eat. It also provides the habitat for all the plants and animals that live on Earth.
The biosphere is a fragile system. It can be damaged by human activities, such as pollution and climate change. It is important to protect the biosphere so that life on Earth can continue.
The other options are incorrect because:
- The stratosphere is the second layer of Earth’s atmosphere, above the troposphere and below the mesosphere. It is characterized by a temperature increase with altitude, due to the absorption of ultraviolet radiation by ozone.
- The ionosphere is a region of Earth’s upper atmosphere that is ionized by solar radiation. It is important for radio communication, as it reflects radio waves back to Earth.
- The mesosphere is the third layer of Earth’s atmosphere, above the stratosphere and below the thermosphere. It is characterized by a decrease in temperature with altitude.