Which step of Koch's postulates is incorrect? A. 1.The pathogen is first found in an infected, unhealthy person. B. 2.The pathogen is isolated from an unhealthy person and grown in a lab. C. 3.The pathogen grown in a lab will be given to a healthy organism that gets the same disease. D. 4.The pathogen should be isolated again and should have mutated when compared to the original.​

The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the correspondingbones in whales have very different shapes and proportions. however, genetic data suggest that all three kindsof organisms diverged from a common ancestor at about the same time. which of the following is the mostlikely explanation for these data? a) humans and bats evolved by natural selection, and whales evolved by lamarckian mechanisms.b) forelimb evolution was adaptive in people and bats, but not in whales.c) natural selection in an aquatic environment resulted in significant changes to whale forelimb anatomy.d) genes mutate faster in whales than in humans or bats.e) whales are not properly classified as mammals.