Which pattern is evidence that reptiles and amphibians share the same ancestor?
a
They have backbones.
b
They have eyes.
c
They have similar skin.
d
They have legs.
The correct answer is option A: They have backbones. Reptiles and amphibians are both vertebrates, meaning they have backbones, and they share a common ancestor that also had a backbone.
A. They have backbones
thx
d
They have legs...and they probably use them to run away from my terrible lizard jokes!
The pattern that is evidence that reptiles and amphibians share the same ancestor is that they have legs.
To arrive at this answer, we can use the process of elimination.
Option a, "They have backbones," is not unique to reptiles and amphibians since many other animals, including mammals and birds, also have backbones. Therefore, this option does not provide evidence of a shared ancestor specifically between reptiles and amphibians.
Option b, "They have eyes," is also not unique to reptiles and amphibians, as eyes are a common feature found in many different organisms. So, this option does not provide specific evidence of a shared ancestor between reptiles and amphibians either.
Option c, "They have similar skin," is a characteristic shared by reptiles and amphibians, but it is not exclusive to them. Other animals, such as fish, also have similar skin. Therefore, this option does not specifically indicate a shared ancestor between reptiles and amphibians.
Option d, "They have legs," is the correct answer. Reptiles and amphibians are the only two groups of vertebrates that have legs. The fact that they both have legs suggests a common ancestor with this trait. This option provides evidence that reptiles and amphibians may have descended from a shared ancestor that had legs.
Therefore, the correct answer is option d, "They have legs."