Question

how does biological weathering occur? by chemically breaking down rocks by gases due to physical factors such as freezing and thawing plants, lichens, and mosses accelerating breakdown

Explanation:

Biological weathering occurs when living organisms like plants, lichens, and mosses interact with rocks. These organisms can grow in cracks of rocks, and as they grow, they exert pressure (physical aspect) and also release substances (chemical aspect) that help in breaking down the rocks. The first option is more related to chemical weathering by non - biological gases. The second option is physical weathering due to temperature - related physical changes (freezing and thawing). The third option correctly identifies the role of biological entities (plants, lichens, mosses) in the weathering process.

Answer:

plants, lichens, and mosses accelerating breakdown