biology homework

1.-What is endocytosis? Please give an example.2.- What happens to a red blood cells if they are exposed to an hypertonic environment? Why ?3.- What is the difference between passive and a active transport? Please give examples.4.- What is a plasmodesmata?5.- Membranes are ________________________ because they let some, but not all, substances pass.6.- What is pinocytosis ?7.- What is a cotransport system ? Why is important?

 
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