Because these non native species can cause competition for the same food source as the native species thus making it harder for the native species to survive. Also the non native species could see the native species as food causing them to die out. As well as introducing new diseases that these native species don’t know how to defend themselves from
The last suggestion is correct....when you have setes of rest in between workouts..you allow the lactic acid to seep into your muscles and ensure that the muscle protein is broken down properly.
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Answer small and large intestines