You have isolated a strain of e. coli that is resistant to penicillin, streptomycin, chloramphenicol, and tetracycline. you also observe that when you mix this strain with cells of e. coli sensitive to the four antibiotics, they become resistant to streptomycin, penicillin, an chloramphenicol, but remain sensitive to tetracycline. explain what is happening. be thorough and complete in your answer.

Some technological solutions to problems like global warming meet the specific needs and situations of local communities. an example from india involves converting the solid waste from cattle into clean-burning fuel for cooking. this reduces the amount of greenhouse gases, specifically methane and carbon dioxide, released into the environment from wood fires. when evaluating the feasibility of implementing this solution, computer models are used to weigh costs against benefits. what factor is least likely to impact the decision on adopting this technology?