Answer:
If there were no plants, the carbon dioxide level in the world would have risen in a much steeper way and the oxygen level would deplete in a much steeper way too.
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Answer:
B
Explanation:
It is the genes first hypothesis
Answer:
D. A brown gas produced
Explanation:
When a chemical reaction occur, there are several changes that takes place such as change in color, odor change, formation of a gas, and formation of a precipitate etcetera.
In the given chemical reaction, two colorless gas (NO and O2) react together and form brown gas (NO2). So, the change of gas from colorless to brown gas is the evidence that shows chemical reaction occurred.
Hence, the correct option is "D. A brown gas produced".
Simple diffusion, which is different from facilitated diffusion.