Given below are two statements. One is labeled Assertion(A) and the other is labeled Reason(R)

Assertion (A): Mosses along with lichens are the first organisms to colonize rocks.
Reason (R): They decompose rocks, making the substrate suitable for the growth of higher plants.

In light of the above statements, choose the correct answer from the options given below.

Assertion (A) is generally correct. Mosses, along with lichens, are often among the first organisms to colonize barren or rocky surfaces. They are pioneer organisms in primary succession, and their ability to grow on rocks is due to their adaptability to harsh conditions and their capacity to anchor themselves to the substrate.
Reason (R) is also correct. They play a role in the initial stages of soil formation through a process called biological weathering. They secrete organic acids and help break down the surface of rocks over time, creating a thin layer of soil. This action contributes to the conversion of bare rock into a substrate suitable for the growth of higher plants. However, it is more about creating a hospitable environment for future plant growth rather than directly decomposing rocks.
Both (A) and (R) are true and (R) is the correct explanation of (A).