Rain falling to the ground. water runs downhill and flows toward the sea.
Hi there!
I cannot answer you question unless you give me some answer choices please
~Jada
A tropism.
A plant movement to a light stimulus is a phototropism.
A plant movement to water stimuli is a hydrotropism.
etc. etc. :)
The outer skeleton provides protection due to the fact that invertebrates do not have backbones