This key element is an essential part of amino acids (proteins). Identify this element. How does this element move through the spheres of Earth? What is this process called?

Some substances but not other can cross the (blank) membrane of a cell

Kate is studying the transformation from unicellular to multicellular organisms. which metaphor is the most appropriate to apply to the map of the timeline.

asap plz when a charge is dropped from a felony to a misdemeanor, which type of plea bargain has happened? ? a. vertical b. horizontal c. avoidance of stigma d. reduced sentence