1 Membranes separate their contents from the environment. 2  Cell membranes separate the cell contents from its environment, and organelle membranes separate the organelle contents from their environment. 3  Membranes regulate the movement of materials through them.
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This week, all of a sudden, a third Tom popped up in the race for PA Governor. Corbett. It all began last Friday when NextGen, a 501(c)(4) organization founded by billionaire Tom Steyer that focuses on climate change, launched a TV ad criticizing Gov. Corbett for his support of oil and gas companies.