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IAG_31 – OpenStax Biology 2e Instructor Answer Guide Chapter 31 Solutions 2026

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OpenStax Biology 2e Instructor Answer Guide

Biology 2e
Unit 6: Plant Structure and Function
Chapter 31: Soil and Plant Nutrition

Visual Connection Questions
1. Soil compaction can result when soil is compressed by heavy machinery or even foot traffic.
How might this compaction change the soil composition?

The air content of the soil decreases.

2. Which horizon is considered the topsoil, and which is considered the subsoil?

The A horizon is the topsoil, and the B horizon is subsoil.

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IAG_31 – OpenStax Biology 2e Instructor Answer Guide Chapter 31 Solutions 2026

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