Odd One Out

Step 1: Concept
Geometry classification (2D vs 3D shapes).
Step 2: Analysis
Square, Rectangle, and Triangle are 2-dimensional (flat) shapes.
Step 3: Conclusion
A Cube is a 3-dimensional (solid) shape.
Final Answer: (D)

Step 1: Concept
Classification based on anatomical characteristics.
Step 2: Analysis
Liver, Heart, and Kidney are all internal organs.
Step 3: Conclusion
The Ear is an external organ/sensory organ visible on the outside of the body.
Final Answer: (D)