No. Some frogs are brightly colored to mimic a poisonous frog so that predators do think it is poisonous.
Yes.
yes, it gives you cholera
yes there is a poison caterpillar
yes
Yes they all are colorful because they have to attract insects for pollination.
They are a venomous species - yes.
All rattlesnakes are venomous, not poisonous. However, there is no such thing as a Texas bluebonnet rattlesnake.
Yes, except the poisionous ones.
Yes, poinsettias are poisionous
well as a matter of fact, yes they are poisionous.
Yes some frogs are poisonous and you can tell because of their color
Yes, all frogs are. All frogs are amphibians.