Positive feedback differs from negative feedback in that one: a. positive feedback systems have only effectors, whereas negative feedback systems have only receptorsb. the positive feedback's effector responses are in the same direction as the initiating stimulus rather than opposite of itc. positive feedback loops are more frequently encountered in the control of homeostasisd. positive feedback benefits the organism, whereas negative feedback is detrimentale. the effector's response increases some parameter (such as body temperature), whereas in negative feedback it can only decrease the parameter

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?