The narrative that a physiological need<span>, </span>such as hunger<span> or thirst, </span>creates an aroused tension state<span> (a </span>drive<span>) that motivates an organism to satisfy the </span>need<span>. An unpleasant </span>physiological tension<span>, </span>such<span> as thirst or </span>hunger<span>, that leads to behavior to </span>reduce<span> the </span>tension<span>.</span>
I believe the answer is...a change in allele frequency over many generations!
Hope this helps!
The esafigis when tucked it makes your foot drop
