Vertebrae
Eagle - Vertebrate
Snake - Invertebrate
Elephant - Vertebrate
Lizard - Vertebrate
Mosquitoes - Invertebrate
Explanation:
Invertebrate - an animal lacking a backbone, such as an arthropod, mollusk, annelid, coelenterate, etc. The invertebrates constitute an artificial division of the animal kingdom, comprising 95% of animal species and about 30 different phyla.
Vertebrate - an animal of a large group distinguished by the possession of a backbone or spinal column, including mammals, birds, reptiles, amphibians, and fishes.
Hope it helps