The organisms that is most likely not functioning as a keystone species in its ecosystem is; the Zebra mussels-Compete with native species, reducing the biodiversity of the Great Lakes ecosystem. Keystone species are plants or animals that play unique and vital role in the way an ecosystem functions. Without keystone species, the ecosystem would be dramatically different or cease to exist altogether.
Whats your question..........
The size of the nucleus of an atom is about 10 raise to power 15 meter, which basically proposes that it is about 10 raise to power -5 or 1/100,000 we can say of the size of the entire atom. A good comparison of the nucleus to the atom is just like a pea in the midst of a track. The volume of the atom is 2 x 1013 times larger than its nucleus.
The only thing I know is that they have different structures but do the same thing, so their function would be the same. I hope this helps. If not, then let me know and I will do the best that I can. Have a great day!!
Proteins (def - organic molecules composed of very long chains of amino acids that play a crucial role in almost everything a cell does)