What is the characterization of a cell membrane that controls which substance can enter and exit the cell?

Which property is used to identify the origin of an igneous rock? color density hardness crystal size

The hypothesis of continental drift states that earth's continents, which are located on tectonic plates, move relative to each other. which of the following is true of the movement of the tectonic plates? a. tectonic plates only move once every million years. b. they move at a rate of approximately 5 centimeters per year. c. tectonic plates never move, only the continents located on them do. d. their movements are very rapid and occur at random times.

What are the two main phases of a cell cycle