Logical reasoning — necessary attribute: identify what a hill must have A hill always has _____. Choose the option that is necessarily true in all cases.

Given

• We must select the feature that a hill possesses in every case.

Concept/Approach
By definition, a hill is an elevated landform above the surrounding terrain; elevation/height is essential to the concept of a hill.

Option check

• Trees — many hills are barren; not necessary.
• Height — elevation above surroundings is defining; necessary.
• Animals — not necessary.
• Water — not necessary.

Final Answer
Height is the only attribute that a hill must have.