what form of limitation is being used in the following scenario?

hikers along a riverside come across a small lagoon with a sign that reads, "restricted access" they find out that only certain members with the correct documents can enter this zone. this sign demonstrates the use of
as a form of limitation.

The table below shows data for a population of fish in a pond. fish body color # of fins scales? tail shape a silver 4 yes fan b pink 4 yes flat c black 4 yes fan d orange 4 yes flat e orange 4 yes fan f silver 4 yes flat which of the above characteristics would be most in developing a classification system for the fish? a. body color and tail shape b. presence of scales and tail shape c. body color and number of fins d. number of fins and presence of scales