The roles of scientists and engineers in the advancement of science and technology complement each other. in general, scientists conduct in-
depth scientific study and research, which provides the foundation for technology, while engineers use this knowledge to carry out the practical
application of science and technology to solve problems. when scientists and engineers test new ideas, they follow similar procedures. match
these steps, which are only a small part of the testing process, to either scientific inquiry or engineering design.

Cold case files recently began re-investigating an old murder case. the murder took place in the park; a young man, james, was hit over the head with a brick and killed. police suspected the jealous former boyfriend of james' wife, karen. whoever killed james may have washed their hands in a near-by bird bath as detectives found blood in the bird bath. since the murder took place before dna fingerprinting was available, the suspected killer, ronnie, went free. detectives are now reviewing the blood evidence using dna fingerprinting. based on the dna fingerprints of all possible suspects, who is james' killer?