Which landform represents the boundary between the land and an ocan or lake a) coastline b) delta c) dune d) glacier

First of all, a coast is where land ends and the sea/lake starts.

Therefore, the coastline, is the "border", or as you said it, the boundary between the continent and a sea or in some cases a lake.

Hope it helped,

BioTeacher101

pregnancy happens more and more

eukarya because is is like alche and b is bacteria and d is animals

explanation: