KEY TAKEAWAYS •
Eukaryotes are unique in that they have mitochondria and/or chloroplasts that have been introduced to the species through endosymbiosis.
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There are advantages to multicellular organisms but a major feature is that high specialization means that one cell cannot break off and reproduce itself.
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There are things that favor the formation of an individual organism from multiple separate parts.
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Kin selection involves giving special favors to another individual in a group because they are related to them.
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Altruism is when one member of a group gives to another, even if there is a cost to the giver.
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