they mate with each other and reproduce
That depends on your definition of "strongest." Kisame had the most chakra, if you want to judge it that way. You could also define "strongest" as the ones who have lived the longest, in which case the strongest members would be Tobi and Zetsu.
no the champion is
all of jls members are strong
The 'strongest' is probably Tobi or Pain. The one with the most chakra is Kisame.
animals
Ensures that the strongest gets to pass on its genes
While there have been observations of elephants showing behaviors that could be interpreted as mourning for their dead, such as touching the body or staying near it for a period of time, there is no conclusive evidence to suggest that elephants bury their dead as a form of mourning and respect.
A. Qualitative
Raccoons are members of the procyonidaefamily.
Gastropoda
The members of a population that are considered to be the most fit are not always the strongest. In a population of wild rabbits, the most fit would be the fastest and the most reactive to danger. "Most fit" more closely means "able to survive long enough to procreate."
animals are mobile and don't have cell walls