Do molecules crossing a membrane using active transport with or against the concentration gradient?

Against the concentration gradient.    

Explanation:

Active transport implies the movement of molecules across a membrane from a lower concentration to a higher concentration, that is to say, against the concentration gradient. The molecules requires energy to go against the concentration gradient, which is usually coming from ATP or an electrochemical gradient.    

In passive transport, the molecules move across a membrane down a concentration gradient without the need for energy.    

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the word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer