What is a defining feature of mammals that is not present in most other vertebrates?
a. mammals maintain a constant body temperature.
ob.
mammals reproduce through internal fertilization.
oc. mammals can produce milk for their offspring
od. mammals have a nervous system with a spinal cord.

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