Question

what is one negative ecological (ecosystem - related) impact on rangelands from grazing livestock?

increased profits for owners
the livestock are very expensive
the weight of the cattle compacts the soil
the land owners make too much money

Explanation:

The question asks for a negative ecological impact. "Increased profits for owners" and "land owners make too much money" are economic impacts. "Livestock are very expensive" is a cost - related aspect. "The weight of the cattle compacts the soil" is an ecological (soil - related) negative impact as soil compaction can affect plant growth, water infiltration, and soil biodiversity in rangelands.

Answer:

the weight of the cattle compacts the soil