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?

a) double loop
b) single loop
c) open
d) recycling

me

This type of circulatory system is called the open circulatory system... :)

Single loop

Explanation:

The circulatory system of the fishes are considered as the single loop circulatory system because they have a single circulatory pattern.

Deoxygenated blood from the body reaches the heart which is then pushed towards the gills. The gaseous exchange takes place between the outer environment and gills and then oxygenated blood is circulated through out the body.

Being composed of one or more cells.

Living things are made of cellS!    <-- notice the plural form of cell ;)
Living things obtain and use energy.
Living things grow and develop.
Living things reproduce.
Living things respond to their environment.
Living things adapt to their environment.