1. The most abundant element in the universe is __________.
B. Hydrogen
C. Carbon DioxideD. Silicon
2. The most abundant element in the Earth's crust is __________.
A. Oxygen
B. HydrogenC. Carbon Dioxide
D. Silicon
3. Each day human body breathe in __________ liters of air.
A. 5,000 to 10,000B. 10,000 to 15,000
0 Comments