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.
Time
Explanation:
it changes over time because it changes the organism over time
Correct answer is The horse started out the size of a small dog and evolved to the larger modern horse.
hopes its help
Answer: 4
Explanation:
It is composed of a cell, but does not have
tissues.
