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Có 4 tế bào sinh dưỡng A,B,C,D thuộc cùng 1 loài nguyên phân 1 số lần không bằng nhau .Biết số tế bào con do tế bào A tạo ra = 50℅ số tế bào B tạo ra = 25℅ số tế bào con do tế bào C tạo ra .Số NST có trong các tế bào D tạo ra = 2432 NST .Tổng số NSTtrong các tế bào con do 4 tế bào A,B,C,D tạo ra là 4560 NST và kỳ giữa của lần phân bào đầu tiên trong mỗi tế bào có 20 cromatit A) Xác định số lần NP của mỗi tế bào A,B,C,D B) Xác định số thoi vô sắc hình thành và số tế bào con lần lượt xuất hiện trong quá trình nguyên phân của 4 tế bào A,B,C,D C) Xác định số NST mà môi trường cung cấp cho cả 4 tế bào A,B,C,D nguyên phân Giúp em với ạ

Mercury is the smallest member of the sun's family. It is only 3.100 miles across. It is also the sun's swiftest planet. Its yearly journey round the sun is only 85 days. Mercury always keeps one side towards the sun. On this side it is always day, on the other side always night. We only see the lighted side. Mercury appears to us like a yellowish orange star. The nearest planet to the sun, it is always seen near the sun, either just before sunrise or soon after sunset. People sometimes call mercury the morning star or evening star. Mercury is half the size of the earth. Because it is much lighter, it has much less gravity. If you can visit Mercury in a spaceship, you will find it a strange world. Its low gravity makes you feel very light. If your weight on earth is 100 pounds, your weight on Mercury is only 27 pounds. Looking at the sun from Mercury, you can see that it's much more brilliant than it is seen from the earth. And the yellow centre of the sun appears three times bigger from Mercury. On its lighted side, Mercury's temperature is about 300 degrees centigrate. But the dark side is extremely cold, but 150 degrees below zero so mercury is probably the coldest as well as the hottest of the planets. 1. A. Mercury is ....... A. the sun's fastest planet B. the coldest planet C. the hottest planet D. all are correct 2. We cannot see the dark side of Mercury because ....... A. it moves very fast. B. it always appears just before sunrise or soon after sunset. C. it always keeps one side towards the sun. D. it is too far for us to see. 3. When can we see Mercury? - We can see it ...... A. just before the sunset B. just before sunrise C. after the sunset D. both A and C are correct 4. Why do we weigh much on the earth than on Mercury? - Because ....... A. Mercury is nearer to the sun. B. Mercury has got less gravity than the earth. C. Mercury is much hotter. D. none are correct. 5. Why does the sun look bigger when it is seen from Mercury? - Because ....... A. Mercury is the smallest planet of the sun. B. Mercury is nearer to the sun. C. Mercury is a light planet. D. It only takes Mercury 88 days to move round the sun.

Giúp mình với các bạn ơi Viết câu có từ nối where or when 11.This is the bank. We borrowed the money from the bank. ->………………………………………………. 12. Do you know a restaurant? We can have a good meal there. ->…………………………………………………. 13. I don’t remember the day. I left school on that day. ->………………………………………………….. 14. The children often go swimming on Sundays. They have much free time then. .................................................. .................................................. ...... 15. The botanist will never forget the day. He found a strange plant on that day. .................................................. .................................................. ...... 16. The meeting was interesting. I went to it. ______________________________________________ 17. The city was famous for its food. We spent our vacation in that city. ________________________________________________ 18. The building is very modern. She lives in that building. ________________________________________________ 19 That is the drawer. I keep all my savings there. ______________________________________________ 20. 1983 is the year. She was born in that year. ________________________________________________ 21. They have just rebuilt the building. I work in that building. ________________________________________________ 22. Wednesday is the day. His plane arrives on the that day. ________________________________________________ 23. Saturday is the day. Boys and girls go together on that day. ________________________________________________ 24. This is the village. I was born in it. ________________________________________________

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