<span>The two main factors that determine nuclear stability are the neutron/proton ratio and the total number of nucleons in the nucleus</span>
the plants developed due to a lack of water and a need to preserve as much water as possible
Isotopes are elements with same atomic number Z= number of protons but different mass number A, where A= Z+N, N= number of neutrons which is variable. As for radioisotopes, I’ve never heard of them before !
Some of the evidence comes from fossils, and some comes from studies that show how similar living things are to one another. By the 1930s, scientists had also learned about genes. As a result, they could finally explain how characteristics of organisms could pass from one generation to the next and change over time
