Question

Which of the following groups of animals is ectothermic

Answer 1

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Answer 2

Ectothermic means its cold blooded
Ectothermic means its cold blooded too
but endothermic means that its warm blooded

One trait that distinguishes the major groups of vertebrates from one another is the way in which they control their body temperature. Most fish, amphibians, and reptiles have body temperatures that are close to the temperature of their environment.

2 Fish, amphibians, and reptiles are ectotherms. An ectotherm is an animal whose body does not produce much internal heat. Its body temperature changes depending on the temperature of the environment. For example, when a turtle is lying in the sun on a riverbank, it has a higher body temperature than when it is swimming in a cool river. Ectotherms are sometimes called "cold-blooded," but that is misleading. The blood of ectotherms is often quite warm.

3 In contrast to the turtle, a beaver would have the same body temperature whether it was in cool water or on warm land. The beaver is an endotherm. An endotherm is an animal whose body controls and regulates its temperature by controlling the internal heat it produces. An endotherm's body temperature usually does not change much, even when the temperature of its environment changes. Mammals and birds are endotherms. They have a stable body temperature that is typically much warmer than their environment. Endotherms are often called "warm-blooded" animals.

Answer 3

@PRAETORIAN.10 An ectotherm is definitely produces internal heat. All life produces heat during metabolism; it is the reason only 10% of the energy is maintained during trophic level changes. An ectotherm is an animal that is unable to internally regulate its body temperature to be close to the optimum for metabolic processes. Some ectotherms are essentially "warm blooded", such as the great white shark. Frequently, their body temps are no where near the environmental temps because ectotherms have behaviors to regulate the body temp, such as sun bathing or entering cool water/shade.

These terms are not favored by many physiologists because the are misleading. Many like homeothermic for endotherms.

A final thought, some biologists/paleontologist think that the largest dinosaurs were essentially endothermic because once a certain body temp was reached, the mass of the dinosaur was such that temperatures at night would not drop low enough or last long enough to affect the dinosaur's body temp.