Question

how should soil samples be preserved if they cant be tested soon after collection? store them in the oven store them in a dark and cool place freeze them air dry them and place them into a warm storage space

Explanation:

Storing soil samples in a dark and cool place helps maintain their integrity. Ovens can alter soil properties (e.g., dry out too much, change chemical composition). Freezing can cause physical damage (ice crystal formation). Air - drying and warm storage can lead to microbial changes and moisture - related property alterations.

Answer:

Store them in a dark and cool place