if you had to define ecological succession in your own words in a 140 characters text, how would you define it?

answerhypothesis;

the planets have a circular orbit around the sun.

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.