<span>The study of the interactions between living things and their environment is called ecology.</span>
First we have to know what an "internal stimulus" is. An "internal stimulus" is something INSIDE of us, that makes us want to do something. Hunger is an example of an internal stimulus. It comes from within us. And it makes us want to eat. So, since hunger is the stimulus, an appropriate response would be to eat some food. Does that make sense?
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flood control dams split and maybe barriers
A bacillus or bacilliform bacterium is a rod-shaped bacterium or archaeon.
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if its biology i think its blocking becouse operators do this in bacterias