As with any living thing no system is the most important. All are required to a similar degree.
They eat all of the flies- we would be surrounded by them if frogs weren't here. Frogs play an important role in the food web of wetlands. If frogs disappear from an area, the whole eco system can suffer.
Most frogs have lungs, but their are lungless frogs. They can also breath thru their skin.
Flies are a source of food for frogs.
The most important system in the upper and lower body is the Circultory System
Frogs need air,food and water
A frogs most common habitat is living in water
Respritory
yes
Yes.
Digestive System.
Mosquitoes are important because other organisms eat them. Such as spiders, birds, bats, and frogs. With out them the food chain would fail. Yes they sucks but there important to the eco system.
No, most frogs are not poisonous. While some species of frogs do produce toxins on their skin as a defense mechanism, the majority of frog species are not harmful to humans or other animals. It's important to always be cautious when handling wild frogs to avoid any potential risks.