Open Circulatory System:
1. Predominantly present in invertebrates.
2. Blood circulates freely through cavities due to the absence of vessels.
3. Commonly observed in arthropods and mollusks.
4. Nutrients and gases are exchanged directly with tissues in open spaces.
5. Limited control over blood flow, as it moves through open compartments.
Closed Circulatory System:
1. Mainly found in vertebrates and some invertebrates, such as earthworms.
2. Blood circulates within vessels throughout the body.
3. Typical in higher animals like mammals, birds, and some advanced invertebrates.
4. Enables precise regulation of blood flow to different tissues and organs.
5. Efficient transportation of nutrients, oxygen, and waste products through a closed network of vessels.