1. Because of evolutionary descent, many species share characteristics with other species to which they are related. Indeed, according to evolutionary theory, all living species are descended from some common ancestor in the ancient past. What evidence supports this conclusion that ALL living species are related to each other? Shared traits in the fossil record; Genetic Code; DNA Structure of all living organisms
2. For some time, Russian prisons have been running on drastically reduced budgets. As a result, when inmates contracted tuberculosis (TB is caused by an infection of the lungs by a particular bacteria species), treatment with antibiotics was often halted before all TB bacteria had been killed by the antibiotics in an infected prisoner. It is now observed that strains of antibiotic resistant TB have appeared in the Russian prison population. Such strains have now reached the United States when freed prisoners have emigrated. What might provide a scientifically valid explanation for the appearance of antibiotic-resistant TB? The antibiotics will attack the non-resistant bacterias first then the resistant bacterias will be killed off second,the resistant allele gets passed down to the next generation if not killed off properly; this is an example of natural selection; there has to be variation within the population.
3. Many flowers attract numerous species and types of pollinators (generalist), but others attract only a single species or type of pollinator (specialist). Hypothesize (A) under what conditions generalist-pollinated flowers should evolve and (B) under what conditions specialist-pollinated flowers should evolve. Generalists use many different resources; specialists use specific resources, a particular type of pollinator. Generalists have more competition between species for the same resource; Specialists have little competition. Generalists are more flexible when it comes to