Answer:
The rules of base pairing explain the phenomenon that whatever the amount of adenine in the DNA of an organism, the amount of thymine is the same. Similarly, whatever the amount of guanine, the amount of cytosine is the same.
Hope it helps a lil! ^_^
Which of what? What’s the rest
Since it has 4 protons, it must have an atomic number of 4. (That makes it beryllium.)
Since it has a 4 protons and 5 neutrons, it has a mass number of 9.
It is a spilling breaker wave