Forum:2 vs 2 rules:need HELP

We often play 2 vs 2 and I want to ask about 3 cards i used in play.

1.After i summoned Soul-Absorbing Bone Tower, then I SSed another zombie type, bone tower's effect would activate making the opponent send 2 cards on top of his deck. Should i pick 1 opponent only for bone tower's efeect OR both opponents will be affected?

2.Needle Worm's effect is the same as Bone Tower's..should i pick an opponent too Or both players will be affected?

3.About Morphing Jar 1, will my teammate be affected also after flipping it?