A graph shows evolution of four animal groups:
Amphibians, reptiles, birds, and mammals. The y-axis is labeled Millions of years ago, starting with 300 millions.
What are amphibians?
A cold-blooded vertebrate animal of a class that comprises the frogs, toads, newts, and salamanders. They are distinguished by having an aquatic gill-breathing larval stage followed (typically) by a terrestrial lung-breathing adult stage.
What are reptiles?
- A vertebrate animal of a class that includes snakes, lizards, crocodiles, turtles, and tortoises.
- They are distinguished by having a dry scaly skin and typically laying soft-shelled eggs on land.
What are mammals?
- A warm-blooded vertebrate animal of a class that is distinguished by the possession of hair or fur.
- The secretion of milk by females for the nourishment of the young, and (typically) the birth of live young.
A. Birds and amphibians have no similarities in their amino acid sequences.
B. Reptile embryos are similar to birds but have no similarities with mammals and amphibians.
C. Mammals have more genes in common with birds than with amphibians.
D. Amphibians and mammals have similar traits that are not seen in reptiles and birds.
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