Which of these best demonstrates mutualism between certain types of bacteria and humans? A Intestinal bacteria obtain nutrients from the gut and produce vitamin K used by humans. B Bacteria become resistant to antibacterial medication that humans use for treatment. Invasive bacteria at an area of injury produce toxins that damage healthy tissues of the human body. D Bacteria in improperly prepared food is consumed by humans, causing food poisoning.​

it will be A because they are both talking about how they are both getting help from the thing in exchange for something. It might be a little confusing at first but if you keep going through and eliminating answers that will be your only answer left

answer: secession

secession, as it applies to the outbreak of the american civil war, comprises the series of events that began on december 20, 1860, and extended through june 8 of the next year when eleven states in the lower and upper south severed their ties with the union. the first seven seceding states of the lower south set up a provisional government at montgomery, alabama. after hostilities began at fort sumter in charleston harbor on april 12, 1861, the border states of virginia, arkansas, tennessee, and north carolina joined the new government, which then moved its capital to richmond, virginia. the union was thus divided approximately on geographic lines. twenty-one northern and border states retained the style and title of the united states, while the eleven slave states adopted the nomenclature of the confederate states of america.

explanation:

d) eastern business owners and former federalists