A free-rider problem.
A trait shared by at least two and perhaps more taxa and devolving on common ancestry is synapomorphy. A homologous trait is quite similar. The forelimbs of all tetrapods are devolved from common ancestry and would be traits shared by many taxa and homologous traits. Cladists use the word synapomorphy more to show closer relationships. Pliesiomorphy is the word cladists use to show more ancient relationships.
A group trait is a characteristic or behavior that is shared by members of a specific group or category. It can help define the identity or culture of the group and may influence how members interact with each other and with outsiders.
A private good (as opposed to a public good).
A characteristic typically shared by all organisms in a group is known as a synapomorphy, which is a derived trait that reflects a common ancestry. These homologous structures can include specific anatomical features, genetic sequences, or developmental patterns that have evolved over time. For example, the presence of vertebrae in all vertebrates is a synapomorphic trait that unites this diverse group of animals. Such shared characteristics help scientists classify and understand evolutionary relationships among different organisms.
A free-rider problem.
A free rider problem
A public good can be defined as a shared benefit at a societal level.
A free-rider problem.
Excludability
Excludability
non-excludability
Outcomes that are shared by the general public are called common outcomes or public outcomes.
A free-rider problem.Non-excludability
A trait shared with a common ancestor is called an inherited or ancestral trait.
An ancestral trait is a trait that is shared by a group of organisms and their common ancestor. It is a characteristic that has been inherited from a common ancestor and has been passed down through generations without change.
having no backbone