The nordic nations have all of these features except

a. common landforms

s. northern location

d. similar histories

f. common religion

why does seem so obvious yet i can't figure it

temperatures get warmer — and heatwaves are more common. nothing says summer like warm weather. this rise in temperatures is caused by the tilt of the earth's axis. our planet doesn't sit perfectly straight as it spins — it has a slight lean of approximately 23.5 degrees with respect to the sun, called the axial tilt.

explanation:

a and b because with the other three, they simplify to something else.