Aristotle classified living organisms as those with blood and those without.
<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?</span>
The nervous system is referred to as a communication system because it carries messages to and from all parts of the body.
<span>Swimming, skiing, weigh lifting, all sport in which several Muscles of body is needed.</span>
The correct answer is: [B]: "beneficial" .
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{<u>Note:</u> A symbiotic relationship known as "mutualism" — in which both organisms benefit.}.
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