The diagram below shows the similar limb structures of a dolphin, a horse, and a bat. Similar bones are highlighted in the same colors.

this is a multiple choice question btw u-u

Which of the following is true about these three species?

All three species have not adapted since their existence.
All three species should be classified within the same genus.
All three species share a distant common ancestor.
All three species evolved over time to best fit unique environments.