Answer:
Channel protein.
Explanation:
Channel protein have gate that opens and close which allow the passage of polar substance or ions to move to permeable membrane of the cell by diffusion. They are water filled and allow the movementof charged molecules inside and outside the cell membrane i.e polar molecules move through non polar bilayer of the cell membrane.
Make an organized chart of data collected
4. A section of DNA that codes for a specific trait.
Spring often comes after winter
Sweating
It does not involve the respiratory system.
