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Prokaryotic organisms tend to be single celled and rely on many simple mechanisms for nutrition and transport. However, eukaryotic organisms are more complex and have multiple systems within in their body, consisting of specialized cells and structures. Therefore, because <span>the need to create many differentiated cell types in eukaryotes means that there must be many mechanisms to modulate gene expression.</span>
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They are known as primary producers of the ocean—the organisms that form the ... Like land plants, they take up carbon dioxide, make carbohydrates using light ... Because they need light, phytoplankton live near the surface, where enough ... toxins that cause can cause illness or death among humans and even whales ...
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