Professional Custom Accounting papers: differentiate between active and passive transport mechanisms?

Professional Custom Accounting papers: differentiate between active and passive transport mechanisms?

 1-Please differentiate between active and passive transport mechanisms?(300 words)

answer this question based on this video:

https://www.youtube.com/watch?v=AcrqIxt8am8&feature=youtu.be

2-  Please differentiate between the ‘dose’ and ‘exposure concentration’ (200 words)

based on this video 

http://toxedfoundation.org/safe-video-english-korean-subtitles/

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