You can only change the facial structure at the beginning of the game, during 'file reconstruction'. After that, go to the equip screen to change armor and weapons.
You take the equipment off both characters then just change the weapons around when you equip the characters again.
There are multiple characters that you can romance, but not at the same time as another.
Some characters won't appear in the later games if you don't encounter them in earlier ones and transfer a saved game to the later ones.
Phase change doesn't effect the mass of substance. However, it cause drastic change of density and the weight of substance may change due to buoyancy force.
Mass is a constant Quantity according to Newtonian Physics.
Yes,because exercise changes your body mass!
Mass Effect 2 allows you change your non-armor outfit as well as your armor.
yes it can change....
No measurable effect at all. The electrons which cause the negative charge have such an unbelievably small mass that billions of them cannot make any observable change to the mass.
After you gain a companion's loyalty, you can change their appearance, however this change is purely cosmetic and does not affect their statistics. You cannot change a companion's armour in the same way as in ME1, nor in the same way as you can customise Shepard's armour in ME2. The only thing you can do is give them improvements through the research options.
You can scan planets and build relationships with the characters. You can also import the save game into Mass Effect 3, or import it into Mass Effect 2 so you start at the same level as when you finished the game. Other bonuses are included if you choose that option.
If by not importing correctly you mean that your Shepard's face is not what it was from Mass Effect and Mass Effect 2? This issue is encountered with people who attempt to import a Shepard that they have played through both of the first games with. The reason for this error is that because Mass Effect did not use the same coding system that Mass Effect 2 & 3 use, the game is unable to generate an accurate render of the imported Shepard's face, often resulting in a Shepard of completely different appearance.