Which example involves a cell membrane receiving and sending messages? a. the cell membrane prevents glucose from entering a cell. b. a transport protein allows a large molecule to enter a cell. c. cells of an organism tell each other when predators are near. d. an enzyme acts as a catalyst for a reaction on a cell membrane.

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