Question

Which animal has a single-loop circulation?
Which two animals are able to generate internal heat to maintain their body temperature in a cold environment?

Answer 1

a. Single circulation system as found in a typical fish species. The red represents oxygen-rich or oxygenated blood, the blue represents oxygen-deficient or deoxygenated blood. Double circulation pathways are found in birds and mammals.

b. Iguanas and rattlesnakes, like most other reptiles—along with most fishes, amphibians, and invertebrates—are ectotherms. Endotherms generate most of the heat they need internally. When it's cold out, they increase metabolic heat production to keep their body temperature constant.

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Answer 2

fish have single loop circulation as posses 2 chamber heart.mammals and birds can maintain body temperature as are warm blooded animals i.e homiothermic