Plant identification/Taraxacum officinale

1 How I can recognize Common Dandelion (Taraxacum officinale Weber ex Wiggers)?

By its habit
By flowers
By foliage
By stem
By root
By fruit

2 Where does Common Dandelion usually grow?

On the water edges
In the forest
On the meadows
By fruit

3 Which of these is a Common Dandelion?