1) What is the basic unit of life? a) leaf b) cell 2) What do pores in leaves allow? a) Materials to enter and exit b) Sunlight to stay inside 3) When guard cells are full of water, what happens? a) The pore opens b) The pore closes 4) What do many-celled organisms have? a) One system only b) Many subsystems working together 5) Why do guard cells become narrow when there is no water? a) To keep water from escaping b) To take in more sunlight

Mr. Abdallah

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