Blood and the circulatory system, and transport in plants by xylem and phloem.
Larger organisms need transport systems to move substances around the body.
Blood
- Red blood cells: carry oxygen (haemoglobin); no nucleus, biconcave shape.
- White blood cells: fight pathogens.
- Platelets: help blood clot.
- Plasma: liquid carrying dissolved substances (CO₂, nutrients, hormones).
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