What are 3 substance transported in animals?

Three substances transported in animals include oxygen, carbon dioxide, and nutrients. Oxygen is carried from the lungs to body tissues by red blood cells, while carbon dioxide is transported back to the lungs for exhalation. Nutrients, such as glucose and amino acids, are absorbed from the digestive tract and transported via the bloodstream to cells for energy and growth. This transport system is crucial for maintaining homeostasis and supporting metabolic processes.