Why is blood red and Lymph colourless or pale-yellow?

Step 1: Functions that plants do not have, e.g. circulation. circulation Step 2: Easy to carry around -- portable model of the heart. portable model of the heart Step 3: Water from the roots to the leaves -- xylem. xylem Step 4: Found in the walls of capillaries -- endothelial cells. endothelial cells Step 5: Where white blood cells are made -- bone marrow. bone marrow Step 6: Lack of water or dehydration -- thirst. thirst Step 7: Made by the spleen -- lymphocytes. lymphocytes Step 8: They have green pigment called chlorophyll -- plants. plants Step 9: The expanding gas bubble does work on -- surrounding water (in swim bladder). surrounding water Step 10: They use oxygen and give off carbon dioxide -- animals. animals Step 11: Formed elements and plasma -- blood. blood Step 12: Red blood cells -- carry oxygen. carry oxygen Step 13: Lymph capillaries -- thin walls. thin walls Step 14: What will happen if a vein bursts -- blood oozes out slowly (low pressure). blood oozes out slowly Step 15: Water and salt will enter the cell -- in hypotonic solution. in hypotonic solution Step 16: Which of these changes controls the environment of the cells -- homeostasis. homeostasis Step 17: Can be dry and dirty -- air. air Step 18: Why blood and lymph carry O2 and food to cells -- cells use O2 to burn food for energy. **cells use O2 to burn