Question

what happens to the soil as simple plants die during primary succession? it turns into rock it dries out completely it becomes richer in nutrients it becomes thinner

Explanation:

During primary succession, simple plants like lichens and mosses colonize bare rock. When they die, they decompose. Decomposition releases nutrients such as nitrogen, phosphorus, and potassium into the soil. Over time, this enriches the soil, making it more fertile and capable of supporting more complex plant life.

• Option "It turns into rock" is incorrect because decomposition of plants does not convert soil back to rock.
• Option "It dries out completely" is wrong as decomposition is a biological process that occurs in the presence of moisture (even if in small amounts) and does not lead to complete drying.
• Option "It becomes thinner" is false. As organic matter (from dead plants) is added to the soil during decomposition, the soil layer actually thickens over time rather than thins.

Answer:

It becomes richer in nutrients