QuestionAugust 11, 2025

Which of the following provides the best comparison between fish and birds? They are both ectothermic but fish have streamlined bodies and birds are bipedal. They are both vertebrates but fish are ectothermic and birds are endothermic. They both lay eggs but fish are jawless and birds have gizzards. They both have two -chambered hearts, but fish have scales and birds have feathers.

Which of the following provides the best comparison between fish and birds? They are both ectothermic but fish have streamlined bodies and birds are bipedal. They are both vertebrates but fish are ectothermic and birds are endothermic. They both lay eggs but fish are jawless and birds have gizzards. They both have two -chambered hearts, but fish have scales and birds have feathers.
Which of the following provides the best comparison between fish and birds?
They are both ectothermic but fish have streamlined bodies and birds are bipedal.
They are both vertebrates but fish are ectothermic and birds are endothermic.
They both lay eggs but fish are jawless and birds have gizzards.
They both have two -chambered hearts, but fish have scales and birds have feathers.

Solution
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Answer

They are both vertebrates but fish are ectothermic and birds are endothermic. Explanation 1. Identify Common Characteristics Both fish and birds are vertebrates, meaning they have a backbone. 2. Compare Thermoregulation Fish are ectothermic (cold-blooded), relying on external temperatures to regulate their body heat. Birds are endothermic (warm-blooded), maintaining a constant internal body temperature regardless of the environment.

Explanation

1. Identify Common Characteristics<br /> Both fish and birds are vertebrates, meaning they have a backbone.<br /><br />2. Compare Thermoregulation<br /> Fish are ectothermic (cold-blooded), relying on external temperatures to regulate their body heat. Birds are endothermic (warm-blooded), maintaining a constant internal body temperature regardless of the environment.
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