Question

Explain briefly
Unicellular organism do not have circulatory system

Answer 1

Gas exchange is one essential function of the circulatory system. A circulatory system is not needed in organisms with no specialized respiratory organs, such as unicellular organisms, because oxygen and carbon dioxide diffuse directly between their body tissues and the external environment.

Answer 2

Answers:-at the core of the human circulatory system is the heart.... A circulatory system is not needed in organisms with no specialised respiratory organs,such as unicellular organisms , because oxygen and CO2 diffused directly between their body tissue and the external environment