What is an ecosystem?

In an ecosystem,

Which of the following is not essential in an ecosystem ?

An ecosystem is

What are decomposer ? What will be the consequence of their absence in an ecosystem ?

What is ozone and how does it affect any ecosystem?

What is ozone and how does it affect any ecosystem?

Which of the following is an ecosystem service provided by a natural ecosystem?

Which of the following is an ecosystem service provided by a natural ecosystem?

What is alpha/beta diversity in an ecosystem ? What is the significance of large genetic diversit in a population ?

Animals are not essential in an ecosystem. Why?