There are tons of antonyms for credible out there, but really good ones include deceptive, dishonest, undependable, unreasonable, etc...
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It can be found in the water table
Answer: Margaret Chase Smith.
Explanation: nice face.
Yes for if you do not thdn you will have false answers
Answer: to prevent any one branch from becoming too powerful
Explanation: Separation of powers means that each branch has specific powers to exercise, powers which no other branch has