The nitrogen compounds through which excess nitrogenis eliminated from organisms are called nitrogenous wastes or nitrogen wastes. They are ammonia, urea, uric acid, and creatinine. All of these substances are produced from protein metabolism.
I've actually learned something similar recently so your best bet is to go with B.
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.
Answer:
They are different layers that protect us...skin protects your muscles, and your muscles protect your cells
Explanation:
Hope this helps :)
If not sorry
