For questions 11-15
11. Magnesium Oxide is a combination between Magnesium and oxygen so the formula will be MgO
12. Calcium Chloride is a combination between Calcium and Chlorine, so the formula will be CaCl₂ the ₂ comes from the fact that there is two Chlorine atoms
13. Lithium Sulfide is a combination between Two lithium and a sulfur atoms,
so the formula will be Li₂S The ₂ coming from the two lithium atoms
14. Barium Selenide is a combination between Barium and Selenium so the formula will be BaSe
15. Aluminum Oxide is a combination between Aluminum and Oxygen, there are two Aluminum atoms and three Oxygen atoms, so it will make Al₂O₃
Hope this helps
I think it is community one that has the higher species diversity
Answer:
The answer is.. D. Brain :)
Reasoning:
Your brain stores info, allows you to get knowledge, process and think, including some responses such as sight, touch, hearing, and scents, and even things such as breathing, digestion, and much more. Your brain helps your heart keep pumping blood, gives control to muscles, and includes your memory.