Yes. All players are "backward compatible", so a 3D Blu-Ray player can play regular Blu-Ray, regular DVDs and even CDs.
No
Yes, Blu-Ray players can play regular DVDs.
All Blu-Ray players can play DVDs
No. You can play regular DVDs with a blu-ray player.
Yes
No, but regular DVDs can be read on a Blu-ray player.
Yes, blue-ray players can play regular DVDs. However, regular DVD players cannot play Blue-ray DVDs.
DVDs can be played on a Blu-Ray player
yes it can play regular movies
Yes
No. Blu-Rays will only work on a Blu-Ray player, but they can play DVDs as well