A A
is a hypothesis or set of hypotheses that is accepted to be true based on observations and repeated experimentation with similar results.

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

the glands which are associated with each description is given below:

wild parsnip is a perennial plant which reproduces rapidly in areas which have no sign of agricultural activity such roadside or at no tillage open areas. it's considered invasive because it can inhibit the growth of another plant  and its reproduction is fast. there are several harmful effects of this invasive plant although its taproot is edible since it is a member of the carrot family. wild parsnips can cause skin blistering when in contact because of the chemicals it contains, second it inhibits the growth of other plants, it will restrict the growth of animals when eaten and lastly, it drives away natural pollinators like bees.