hurry plz
Heart is to the ________ system as lungs are to the _________ system

respiratory; endocrine


nervous; endocrine


endocrine; muscular


circulatory; respiratory

Which of the following could be compared to soldiers?
Question 3 options:


white blood cells


Your heart


red blood cells


Your lungs

Which system is responsible for the transportation of blood throughout the system?
Question 4 options:


respiratory system


circulatory system


endocrine system


digestive system