The area around the earth where life activities go on is referred to as

Step 1: Analyze the question The question asks for the term for the region around the earth where life exists and life activities take place. It is about the whole earth, not one small place.

Step 2: Explain the concepts

• Biosphere: The part of the earth where living things exist. It includes the land, water, and air, and is the sum of all ecosystems.
• Lithosphere: The solid, rocky outer part of the earth (the crust and upper mantle). It is not defined by life activities.
• Habitat: The specific place where an organism or community lives, such as a pond, a tree, or a termite mound.
• Ecosystem: A community of living things interacting with one another and with their non-living environment, such as a forest or a lake. It is a smaller unit than the whole earth.

Step 3: Solution The question says "the area around the earth where life activities go on". This is the whole zone that supports life, which is the biosphere (bio = life, sphere = region around). The other options are either not about life (lithosphere) or too small and specific (habitat, ecosystem).

Step 4: Answer The correct option is **A.

Tip: Remember the order from small to large: organism → population → community → ecosystem → biosphere. The word "sphere" suggests a whole layer around the earth, and "bio" means life.