C. The lungs can better exchange oxygen
Answer:
A/D
Explanation:
D, Fertilizers put more sulfur in the ground than their should be.
A, fossil fuels, could also be the answer. When we combust fossil fuels we release the sulfur in them into the atmosphere when they should not be in the air.
Answer:
Household biology is the study of household animals,insects,etc.,including how to prevent damage to our own body and to our belongings
An experiment or survey must be controlled in order to receive accurate results.
In an experimental group, the independent variable is changed. But in the control group, the independent variable stays the same.
Answer:
1/2 x 9000 x 30x30=4050000 joule
Explanation:
4050000 energy
