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Consider this sentence:

"In this unit, you will read about the amazing physical abilities animals developed to help them survive."

what's the meaning of this phrase: the amazing physical abilities animals developed to ...

if an animal develops their abilities they become more powerful.

so the sentence should be like this ... physical abilities animals developed them to help them survive.

so anyone can explain this phrase?

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animals developed to help them survive is a subordinate clause (but one that is not introduced by which or that) modifying the noun phrase "the amazing physical abilities".

In this unit
   you will read about
         the amazing physical abilities
            (which|that) animals developed to help them survive

them refers to the animals.

Compare:

These are the ladders fire-fighters use to help them put out fires.

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