Final answer:
The correct sequence is digestion, absorption, circulation, diffusion, and synthesis. Food is digested into smaller fragments, absorbed mainly in the small intestine, circulated, diffused into cells, and then used for synthesis.
Step-by-step explanation:
The correct order of events for the production of necessary complex molecules after food is taken in by a multicellular animal is digestion, absorption, circulation, diffusion, and synthesis.
Digestion is the mechanical and chemical breakdown of food into small organic fragments that are suitable for absorption across the digestive epithelium. Most absorption of nutrients takes place in the small intestine, where nutrients are absorbed into the bloodstream or lymphatic system (circulation). Following this, nutrients diffuse from the circulatory system into cells, where they are used in various synthesis processes to build or repair cellular components.