Biology

Guest

27 January, 19:44

Question 15 of 20:

Select the best answer for the question

15. Fish respiratory systems exchange gas and receive oxygen at the gills. This oxygen then enters the

blood stream and is pumped through the heart and back through the gills without first returning to the

heart. This order of events best describes which type of circulation system?

O A. Single loop

OB. Open

C. Recycling

OD. Double loop