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The video explains that bacteria consist of a single cell, while complex organisms like humans have up to 100 trillion cells. Cells vary significantly in size and function, with most being microscopic. The largest cell is an unfertilized ostrich egg, which weighs about 1 kg.

What is the primary difference between bacteria and complex organisms?

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How many trillion cells can complex organisms, like humans, contain?

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In what ways do cells vary?

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What is the approximate size of most cells?

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What is the heaviest cell known, and what is its weight?

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