in the earthworm body plan, the digestive system can be described as a tube-within-a-tube. where would you expect to find most of the tissues that developed from endoderm?
Where would you expect to find most of the tissues that developed from endoderm in the earthworm body plan?
Answer:
In the earthworm’s body plan, the digestive system is organized in a tube-within-a-tube structure. The endoderm is one of the germ layers found in developing embryos, from which the lining of the digestive system originates. Therefore, most of the tissues that developed from the endoderm in an earthworm would be expected to be located in the inner tube of the body plan, which represents the digestive tract. This inner tube consists of tissues derived from the endodermal layer, including the epithelial lining of the gut, organs such as the stomach and intestines, as well as associated structures like the liver and pancreas. It is within this inner tube where the majority of endoderm-derived tissues responsible for the digestion and absorption of nutrients can be found in an earthworm’s body plan.