Forensic science
what is not a guideline required for a valid evidence test?
a the test must be conducted by a forensic scientist in a forensics lab.
b the test must be reproducible, producing the same results every time using the same samples.
c the test must be specific to identify a particular substance.
d the test must be sensitive in that it can pick out the unique characteristics in a sample
me out quick 20 points,
ill give brainiest,
don't answer "i don't know" that doenst me out man

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)

Awhite-blue star is hotter than a red star. select the best answer from the choices provided true or false

When can a theory be modified if a new type of technology allows for new observations that raise new questions? a-immediately, while the questions about the theory are being asked b-after new hypotheses related to the theory are tested in experiments c-only after the new observations disprove all parts of the theory d-while scientists begin to think about how the theory could improve