A) single loop
Fish have a two-chambered heart in which a single-loop circulatory pattern takes blood from the heart to the gills and then to the body.
Is there optional cause it just so many words like a story?
1. Homeostasis
2.Human ( a mammal)
3. B- it should be this, they swell and the stomates close, making the leaf bigger and letting it get more sunlight
