What type of transport is shown here? A diffusion
B membrane
C endocytosis
D facilitated diffusion

a axis of a graph is a color or shade so we can all go outside and have a party so we can eat   some grilled cheese sammiches and broccoli and have some ugly fun times

i don't know why i put this, i know its not the i was just bored : p

delete this answer while you can

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

answer; civil inattention;