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".
An anterior pituitary gland
Answer: 298.9 million years old
Explanation: hope it helps luv ❤✨
This answer to this question is true
Solar energy.
This is because the solar energy arrives and is trapped as radiation and heat.