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OpenStudy (elise_a18):
Which of the following best explains ways in which fish and mammals differ? Fish are invertebrates and have scales and paired fins, while mammals are vertebrates and have fur or hair. Fish are ectothermic and lay eggs to reproduce, while mammals are endothermic and give live birth to offspring. Fish are endothermic and have gills, while mammals are ectothermic and have lungs. Fish have streamlined bodies and three-chambered hearts, while mammals are bipedal and have four-chambered hearts.
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OpenStudy (ondinana):
The first or second option is your best choice. :)
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