Answer: The Golgi apparatus
Explanation: The Golgi apparatus modifies, sorts, and packages different substances for secretion out of the cell, or for use within the cell.
Threatened means they are lowering in numbers and nearing to be endangered.
Endangered means they are dangerously close to being extinct
Extinct means there is none of them left in the wild.
I hope this is what you meant.
The skeletal system is responsible for support, movement, calcium storage, and it also regulates the endocrine system.
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The site for gas exchange in the lungs is the alveoli.
