Indium does not have a biological role in the human body.

Several group 13 elements have biological roles in the ecosystem.

None of the group-13 elements has a major biological role in complex animals, but some are at least associated with a living being.

In some animals its biological role is more clearly defined.

However, iodine is not known to have a biological role in plants.

For instance, a boy cannot take the biological role of mother.

It is the human brain and its biological role in mental illness.

It has no significant biological role and is not particularly toxic.

Tin has no known natural biological role in living organisms.

Tungsten has no known biological role in the human body.