Which of the following are true of trans-fatty acids? A. help membranes function normally
B. cause the shape of fatty acids to be incorrect

lichens that colonize bare rock secrete acids that break down the rock and start the soil-production process. so they expose rocks

bradycardia ( blood presssure below 120/80mmhg )

it is contraindicated to give nitroglycerin to patients with blood pressure that is lower than normal range because the drug can cause blood pressure to drop further. it can lead to paradoxical bradycardia and less commonly, threatening hypotension.