I'm pretty sure the answer is fingerprint scanning.
Answer:
for checks and balances.
Explanation:
Check and balances is a system that we implemented within our government to prevent one branch of the government from becoming too powerful.
The President is part of the executive branch, and the law is created by the congress which is a part of the legislative branch.
By creating a requirement of approval, the constitution provided a way for the executive branch to limit the power of the legislative branch. The president have the power to reject a legislation by the congress if the president believe that the legislation will not be beneficial for the citizens.
I believe the answers are:
-Scientific theories can be made obsolete by new experiments or observations.
This can happen as long as the new experiments provide stronger evidence for conflicting conclusion.
-Scientific findings are based on carefully tested and scrutinized observations.
From the observations , scientists would create a conclusion best on the objective evidence, which usually revolves around relationship between variables.
-Science is a process that is limited to answering questions about the natural world.
This happen because unlike in mythical world, Natural world leaves trails of evidence that can be measured
