1) What is the most important unit in an organism? a) cell b) molecule c) atom 2) How many levels of organization are there? a) 4 b) 10 c) 8 3) What is the last step / level? a) organ system b) organelle c) organism 4) What goes after tissue? a) organ b) veins c) organ system 5) What is the smallest of them? a) cell b) atom c) molecule

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