Earlier quoted context omitted.
Many larger systems are more than the sum of their parts. Enough that you could consider the grouping it's own entity. Ant hills are the canonical example because individual ants are recognizable as 'animals', but the function of an anthill clearly relies on a complex interaction between more simple ants. Just as we are made of tiny organisms, bigger systems could be considered to be made of us.
Hofstadter wrote a nice piece on how an ant colony could be thought to be an entity in itself. My favourite quote pasted from an online source: Anteater: "I reject holism. I challenge you to tell me, for instance, how a holistic description of an ant colony sheds any more light on it than is shed by a description of the ants inside it, and their roles, and their, interrelationships. Any holistic explanation of an ant…
(To avoid debating materialism vs idealism use another creature, say "chimp", instead of "human" - assuming that you agree that chimps have a consciousness.)
I am not fond of the holistic / emergent idea but I don't think "we can't figure out the exact place where the sum becomes larger than its parts" is a good argument against it.