Answer:
A and D
Explanation:
I took the test, and choose both B and C and got it wrong
Answer: silicon Si, Germanium GE
Explanation:
To supply oxygen to the body, the respiratory system works closely with the circulatory system. As oxygen is taken in into the lungs, it travels through blood vessels, which then circulate oxygen-rich blood to cells and tissues.
Answer:
The empirical formula is N2 CH4 O
Explanation: