​How many openings does the digestive system in Platyhelminthes have?​

Correct option is A

The digestive system of Platyhelminthes, also known as flatworms, has one opening that serves as both the mouth and anus: 

• Because of this, the digestive system of Platyhelminthes is considered incomplete, as it doesn't have a separate anus. This means that food can't be processed continuously. 

Here are some other characteristics of the digestive system of Platyhelminthes:

• The opening is located outside the body. 
• The pharynx is a tube-like part of the mouth that flatworms use to feed. 
• The pharynx can be extended to find food and is lined with ciliated epithelium. 
• Flatworms can inject digestive juices into their prey and then suck up the liquefied juice. 
• Platyhelminthes are soft-bodied, unsegmented invertebrates. 
• They are acoelomates, meaning they don't have specialized circulatory and respiratory organs. 
• This limits their shape to being flattened, which allows oxygen and nutrients to pass through their bodies by diffusion.