การย่อยอาหารของสัตว์ไม่มีกระดูกสันหลัง

1. The document summarizes the digestive systems of several organisms including sponges, hydra, planaria, earthworms, and insects. 2. Key components that are common across many of these organisms include a mouth, esophagus, stomach or crop for digestion, and an anus. 3. The structures and functions can vary between species, such as sponges lacking a true digestive system and hydra and planaria utilizing intracellular and extracellular digestion.Read less