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Why do populations in the deep sea tend to have longer life spans than those in the higher layers?

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Because their are less humans who could harm them and less pollution and less predators.
User MikeTheTall
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Answer:

Why do populations in the deep sea tend to have longer life spans than those in the higher layers?

This is as a result of presence of abundant nutrients as well as less temperature that allows organism to thrive better also the presence of substances that organisms attach to. Furthermore, absence of light which makes prey to hide from their predators

Step-by-step explanation:

User PyNEwbie
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