Answering the question, this deficiency does not affect planarians in any way because their cells are close to the gastrovascular cavity or the external environment
Planarians do not have a circulatory or respiratory system and this does not cause a problem because they can diffuse oxygen and carbon oxide through the cell wall of their body cells: because planarians possess these characteristics they do not require a dedicated respiratory and circulatory system.
Planarians are flatworms and they belong to the class Turbellaria and they can be found almost in all habitat on earth. They reside both in salt water and fresh water. Some of them also live on land, that is, they are terrestrial and often live under logs.
Planarians have some special abilities; they can restore any lost part of their body. Some of them possess two eyes that can discover or recognized the direction of light.
Also, one of the key characteristics of planarians is that they have three germ layers which include ectoderm, mesoderm, and endoderm. Their body is very solid and they lack body cavity.
Therefore, the fact that planarians lacked dedicated bodily system does not cause a problem because their cells are close to the gastrovascular cavity or the external environment
LEARN MORE:
KEYWORDS:
