Which activity could trigger primary succession? a destructive hurricane

a sweeping forest fire

a mining expedition

a volcanic eruption

Are these strong bases, neutral, strong acids, weak acids or weak base household bleach (ph=12.6) fluid in a car's battery (ph of less than 1.0) milk (ph=6.7) stomach contents (ph=2.2) pure water (ph=7)

Which structure in the cardiovascular system connect arteries to veins?

Is this mrna or rna need need the answer in a hurry