hey there! : )
i have this same question on an assignment i have to do and i was trying to figure it out as well and was gonna see if anybody else had this question answered. i'm sorry, i wish i could . i'll get back to you if i have and get it done. good luck!
excretion is the removal of material from one living thing, for example. humans excrete tears, sweat, carbon dioxide etc.
secretion is the movement of material from one point to another, for example. humans secrete enzymes, hormones, saliva etc.
basically in summary excretion is the removal of physical material and secretion is the movement of biological materials from one point to another.
i hope this was clear enough lol