do you understand that its just all subjective thing?  and in science, specialy, biology its just humans label and delineate stuff for themselfes? in reallity, and techicly correct answer is all life is rna that copy it selves and all life is just copy of copy of that rna and all animal stages and species is just fucking subjective thing that humans (scienties) invented for themselves to simplify categorization in the world. again, it's like saying sun in center of solar systemm, but its not, you techicly will be wrong if you said that.
Pirate