Centrioles is only found in animal cells but not in plant cells.
This will help http://www.answers.com/Q/What_is_the_result_of_the_diversity_of_organisms_present_on_earth
Answer:
not see clearly yrr.........
<span>In the "all or none" law of muscle contraction, it states that when the stimulus applied exceeds threshold then the the nerve sending signals to a few muscle fibers will give a complete response; contraction. Graded response is dependent on how many motor units have been recruited. The more motor units, the greater the force in the contraction.</span>
This is the excretory system
