Biology is the study (2) of life (1)
Abiotic features are not living. they may play a role in helping biotic creatures live, but them theirselves do not live.
Answer is B) decay at a constant rate
Isotopes of an element are defined has that has same atomic number but different mass number mean they have different number of neutrons
so the statement that best describe a similarity is
<span> same atomic number; different mass number
</span>so correct option is C
hope it helps