In the diagram, what is the diameter of Mercury? 
Definitions:
Photosynthetic Cells
Cells that contain chlorophyll and can convert carbon dioxide and water into glucose and oxygen, using sunlight.
Mineral Ions
Charged particles from minerals that plants absorb from the soil, which are crucial for their growth and development.
Sieve Elements
Specialized cells located in the phloem of vascular plants, responsible for assisting in the movement of sugars and nutrients.
Vessel Members
Specialized cells that form part of the xylem vessels in plants, involved in the transport of water and nutrients.
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