Razor Fangs,
First off, welcome to the forum!
The combat table is a little confusing if you are used to a "Roll High" system. V&V is a "Roll Low" combat system, so a zero means a small chance to hit. So where you have a zero, you add and subtract any modifiers (level differences, proficiencies, facing, etc.) to get the final roll requirement.
Take Adaptation for example. Adaption should work pretty well against Chemical Attacks. The base chance to hit is zero, showing a small chance to be hit but it would not be of much use against Emotion Control, there is no modifier and you use the base (7) for the attack type.
So a 5th level bad guy using a chemical attack against a 2nd level hero with Adaptation would be a base 0 with a +3 modifier due to level difference. Being a bad guy, he is attacking from behind, so he gets another +4 for a final attack modifier of +7, so a roll of 7 or less on a d20 means a successful hit.
Similarly, an Android Body would be pretty susceptible to Chemical Attacks, so the base chance to hit is even greater (15) than normal (11) for Chemical Attacks.
Changing the hero to an Android Body instead of Adaptation, you get a base 15 plus 3 for the level difference plus 4 for attacking from behind for a final roll required to hit at 22 (15+3+4) on a d20 so basically the bad guy only misses on a natural 20.
Most of us abide by the natural 1 always hits and a natural 20 always misses, leaving a 5% chance for either, just to keep it interesting. There's always a chance to hit and always a chance to muff it, no matter what.
Hope this helps.
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