Marian is crushing cookies to use as an ice cream topping. She has 450 grams of cookie crumbs when she is finished. According to the law of conservation of mass, what was the mass of the cookies when they were whole? a. 550 grams
b. 400 grams
c. 450 grams
d. 225 grams

When in solution, a molecule that moves slowly across an artificial membrane moves rapidly across a plasma membrane. this molecule rapidly enters the cell regardless of whether its concentration is higher inside or outside the cell. using this information, which transport mechanism is most likely to be responsible for the movement of the molecule across a plasma membrane? view available hint(s)when in solution, a molecule that moves slowly across an artificial membrane moves rapidly across a plasma membrane. this molecule rapidly enters the cell regardless of whether its concentration is higher inside or outside the cell. using this information, which transport mechanism is most likely to be responsible for the movement of the molecule across a plasma membrane? active transportexocytosis