What decomposers are and what happens without them

The same question, asked 4 times: 2023*, 2024*, 2025*, 2026. Every wording below, oldest first.

Try each one first, then open its answer.

Question 1
2023
21 $List two reasons to show that the existence of decomposers is essential in an ecosystem.$
Question 2
2024
26 $What are decomposers ? List two consequences of their absence in an ecosystem.$
Question 3
2025
33 $What are decomposers? Give two examples. State how they maintain a balance in an ecosystem.$
Question 4
2026
10 $What are decomposers ? List two important roles they play in the environment.$