The answer is A
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Answer:
Explanation:
The respiratory system works with the circulatory system to provide this oxygen and to remove the waste products of metabolism. It also helps to regulate pH of the blood. Respiration is the sequence of events that results in the exchange of oxygen and carbon dioxide between the atmosphere and the body cells.
1. Protons
2. An atom with 6 protons and 6 neutrons - an atom with 6 protons and 7 neutrons
3. C
4. The same volume, but a different shape.5.Physical
6.Bubbles
7.<span> Picture I shows a chemical change, because a new substance is formed
8.I
9.Ge
10.</span> The elements have the same number of valence electrons.
Answer:
6 protons
4 electrons in 1st shell
2 valence electrons 2nd shell