Which of the following is correct for the circulatory system of cockroach
It is present on the dorsal side and it has thirteen units of heart in abdominal region
It is present on the ventral side and it has ten abdominal and three thoracic units of heart
It is present on the ventral side and it has thirteen units of heart in abdominal region
It is present on the dorsal side and it has ten abdominal and three thoracic units of heart