So basically it's a graphical model of the community of any environment. And if one part of the community is exterminated or gained in population to an excessive amount, then drastic consequences can happen in that community.
Much like a thermostat regulates the temperature inside your home the hypothalamus regulates your body temperature. (hopefully that'll help a little. all i could find)
They are considered complex because they are ever changing. Something is constantly happening in the cell, whether it be protein creations, Mitosis, or Meosis, or even just the regular transportation of proteins throughout the cell.
The best and most correct answer among the choices provided by the first question is the third choice or letter C "<span>principle of uniformitarianism."</span>
On the other hand, the best and most correct answer among the choices provided by the second question is the third choice or letter "Worms don't have hard parts."
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