What type of transportation is this scenario? a red blood cell made up of 9% potassium has a sodium potassium channel that moves the potassium ions across the cell membrane. if the surrounding plasma which contains 5% potassium and the cell is only permeable the solvent. osmosis active transport diffusion facilitated diffusion?

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

Acommon kind of mechanical weathering is called

What are the proteins in connectivity tissues of your foot examples of?