Well, I don't fully understand your question. I think I know what you're getting at though.
In a system of sexual reproduction, you have genes coming from both an egg and the sperm. Therefore, it'll only contain half the total amount of chromosomes (46 in humans). A sperm will have 23, and the egg will have the other 23. Is that what you meant why the chromosomes are cut out in pairs? If that wasn't your question, please elaborate and I'll return to answer it to the best of my capabilities.
Answer:
CO₂, also known as carbon dioxide
Explanation:
In the alveoli, oxygen enters the bloodstream, and carbon dioxide exits, the latter to be exhaled from the lungs.
The answer is B :)- because snow only falls below freezing.
Answer:
Driver
Explanation:
You can't tell if the car is moving by looking at the driver as they are in the car with you
Answer:
<em>Direct purposes include bathing, drinking, and cooking, while examples of indirect purposes are the use of water in processing wood to make paper and in producing steel for automobiles.</em>
Explanation:
<h3>I hope this helps!!</h3>
