1. for most of the 17 years in which he was active, the identity of the unabomber remained a mystery.

true false

2. polygraph machines measure physical changes in the body when the individual is asked 'yes' and 'no' questions.

true
false

3.false positives occur when the examinee tells the truth but his response is recorded as a lie.

true
false

Answer  they are all true.

Explanation:

The Unabomber had no identity until he finally confessed in 1998. Therefore, the answer is true, (its almost like a trick question.)

The Polygraph machine does measure physical changes in the body, so the answer is true.

False positives are when the examinee tells a truth but it is recorded as a lie.

b..

is the correct one

explanation:

covalent bonds form as valence electrons are shared between two atoms. lewis structures and structural formulas are common ways of showing the covalent bonding in organic molecules. formal charge describes the changes in the number of valence electrons as an atom becomes bonded into a molecule.

a boiling water reactor does not boil the water. a pressurized water reactor boils the water faster. a pressurized water reactor is heated directly by the core. a pressurized water reactor does not use fission.