Dạng đột biến nào sau đây làm giảm số lượng gen trên một NST? A: Lặp đoạn NST. B: Mất đoạn NST. C: Mất 1 cặp nuclêôtit. D: Đảo đoạn NST.

Bài 2 Đốt cháy 5g ankan A cần dùng vừa đủ 12.32 lít khí CO2.Tìm CTPT của ankan A

1.-10-14-16+43 2.34+(43)+66-57 3.56+(-43)+66-57 4.32+|-23|-57+(-23) thực hiện phép tính các bạn ghi đầy đủ nhé! cảm ơn các bạn

Cho a,b,c dương sao cho abc=1 Chứng minh rằng: $\frac{a^{2}b^{2} }{a^{7}+a^{2}b^{2}+b^{7}}$+$\frac{b^{2}c^{2}}{b^{7}+b^{2}c^{2}+c^{7}}$+ $\frac{c^{2}a^{2}}{c^{7}+c^{2}a^{2}+c^{7}}$ $\leq$ 1

III Give the correct form of the words in brackets 1. He always does his work_________ (good) 2. Her sister plays the violin__________ (beautiful) 3. you walk very ___________ (fast) 4. She always speaks___________ to her child (soft) 5. Helen is a very_________ student . (Slowly) 6. Helen work very _________ in her new job . (hard) 7. You should drive more__________ along this road.(slow) 8. This is an____________ exercises________(easy) 9. Tense an_______ exercise. (easy) 10. Come here________ we need your help. (quick) 11. My mother is a________ of English. (teach) 12. He is a famous_________. (act) 13. Her father is a __________. (famous) 14. She sent her best wishes for my future_______. (happy) 15. ________are trying to find out new stars. (science)) 16. We are proud of our _______(friend) 17. There articles were written by a good_______(report) 18. He war punished for his______(lazy) 19. This______ has written many stories for children (write) 20. This is the biggest ______in the city .(build) 21. He’ll never forget his happy_______(child) 22. Peter is an _____member of our club. (act) 23. We like going in his car as he is a______ driver. (care) 24. AIDS is a_____ disease. (danger) 25. Do you often read_______ newspapers ? (day) 26. They are watching an ______foot ball match on TV. (excite) 27. She is ______of doing the same things ever day. (tire) 28. What do you usually do on ______days ? (sun) 29. These are ______toys for children. (use) 30. She looks ______in her new coat . (attract) 31. he turns out to be the _____student in his class. (good)

Giúp mình vớiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii please!

động lượng của một ô tô 1500kg tăng 9.0*10^3s. tính độ lớn của lực làm ô tô hãm phanh và vạn tốc của ô tô

1. We don’t visit you very often because you live so far away.  If you 2. That book is too expensive, so I’m not going to buy it.  If the book 3. We don’t go out very often because we can’t afford it.  If we 4. We haven’t got any money so we can’t go on the trip.  If we 5. Water these plants or they will wither.  If you 6. I have to work late tomorrow, so I can’t join your party.  If I 7. Unless you study harder, you won’t pass the final exam.  If you 8. I’ve got a lot of work to do, so I can’t go home for lunch now. If I 9. She is not a millionaire so she can’t buy a house in Tokyo.

Giúp mik giải bài 2 câu e, f, g, h, vs ạ

Cho sơ đồ phả hệ sau: Biết rằng alen A quy định không bị bệnh trội hoàn tòan so với alen a quy định bệnh. Theo lí thuyết, kiểu gen của những người: I1 , II4 , II5 và III1 lần lượt là A: XA XA , XA Xa , Xa Xa và XA XA . B: aa, Aa, aa và Aa. C: XA XA , XA Xa , Xa Xa và XA Xa . D: Aa, aa, Aa và Aa.