Answer:
Approximately 10,5
Explanation:
The question is not really very specific, because it would need the percentages of those isotopes in the nature. As they are not shown, it should be the median of those two numbers.
atomic weight ≈ 
= 10,5
If you check a periodic table, you'll see it's actually 10,8, but that's because of the thing I told you at first (percentages missing).
Hope I could help.
Answer: Chloroplasts
Reasoning: I just had my 830th lesson in school about these
The moon used to be connected with Earth. A meteor hit several billion years ago and split the Earth and Moon apart. This explains why they share the Sam properties.
Oil consists of many B. Covalent bonds between the nonmetals of Carbon, hydrogen and oxygen.
Answer:
The nervous system
Explanation:
The nervous system send messages from the brain to the muscles to move.
