Aresearcher has a petri dish containing several species of bacteria, but no viruses. she notices that the population of e. coli in her petri dish has no antibiotic resistance. two weeks later, she reassesses the bacteria and finds that the e. coli have acquired antibiotic resistance. how could this have happened?

Bacteria can get antibiotic-resistant gene through the process of transformation, conjugation, and transduction. In transduction, the virus is required to provide the extra gene to the bacteria.

In transformation bacteria takes the genetic material from its surroundings and in conjugation bacteria can take or transfer antibiotic-resistant gene by sex pills. Therefore in this case virus is not present then transduction can not contribute to the antibiotic resistance gene to E.coli.

So conjugation and transformation are the methods by which E.coli can acquire antibiotic-resistant genes from other bacterial species.

yes!

explanation:

because it has a type of fat that can make you extremely sick

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.