What type of metal extraction method is phytomining classified as?

The correct option is Biological method. This answer is correct because it matches the approved learning objective to describe phytomining as using plants to absorb metal compounds from soil. (HT only) in the subtopic Alternative methods of extracting metals.

The correct option is Biological method. Biological method is correct because it directly supports the approved learning objective to describe phytomining as using plants to absorb metal compounds from soil. (HT only). This belongs to the subtopic Alternative methods of extracting metals within Using the Earth's resources and obtaining potable water, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from Alternative methods of extracting metals.