Located in plant cells are large irregular shaped green structures called chloroplasts. They are green because they contain a green pigment called chlorophyll.
An open circulatory system is a type of circulatory system in which nutrients and waste are moved through the body with the assistance of a fluid which flows freely through the body cavity, rather than being contained in veins.
Difference between Open and Closed circulatory system. Higher animals require greater and speedier supply of nutrients and oxygen to their tissues and also a rapid disposal of respiratory and nitrogenous wastes.