C. How long does it take a paper bag to break down?
Answer:
Classification of Living things
Explanation:
The answer would be Sputnik 1. This was a Russian space probe launched during the Space Race between the Soviet Union and the United States.
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
