Answer:
one that has an unstable nucleus
Explanation:
An isotope is defined as a chemical variant present in an atom with different number of neutron but same number of protons.
Radioactive decay is the sudden breakdown of an atomic nucleus allowing matter and radiation to be emitted from the nucleus. A radioisotope with unstable nuclei undergoes radioactive decay because they do not have adequate binding energy to keep the nucleus together. there are four types of Alpha, Beta, Gamma Decay and Positron Emission.
Hence, the correct option is "one that has an unstable nucleus"
The lack of sunlight in deep oceans limit these types of organisms that can survive
<span>it relies upon what variety of cellular. yet maximum of them could enable too a lot salt or water to go into the cellular, and osmosis and differentiation could be no longer possible, and the cellular could top off and explode.</span>
Pigments in photosystem 1 use energy from light to reenergize the electrons.
Mainly there is cell wall at the outer of prokaryotes ! but not have cell wall as PPLO or mycoplasma don't have cell wall !
