Dạ lan đỏ trội hoàn toàn so với dạ lan trắng, giao phấn giữa hai cây P thu đc F1. Tiếp tục cho F1 tự thụ thu đc F2 có 121 đỏ:239 hồng:118 trắng a) giải thích đặc điểm di truyền của màu hoa, kiểu gen P và F1 b) viết sơ đồ lai từ P đến F2. Nếu cho P lai phân tích thì như thế nào? c) có cần kiểm tra độ tính chất của cây hoa đỏ bằng phép lai phân tích không? Tại sao?

Phép tu từ được sử dụng trong văn bản chiếc lá cuối cùng nêu tác dụng

Một hình lập phương 7cmx7cmx7cm được tạo bởi các khối nhỏ 1cmx1cmx1cm và 1cmx1cmx2cm. Vậy có thể xếp nhiều nhất được bao nhiêu khối 1cmx1cmx2cm ?

: We shouldn’t swim in this lake. Water is highly polluted. A: We shouldn’t swim in this lake because water is highly polluted. B: We should swim in this lake because water is highly polluted. C: We shouldn’t swim in this lake so that water is highly polluted. D: We shouldn’t swim in this lake although water is highly polluted. 7 Choose the word whose underlined part is pronounced differently from the others. A: bread B: measure C: pleasure D: untreated 8 Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions. The Earth Day comes from the idea of a former US politician Gaylord Nelson. He was worried about the world pollution, and the health of plants and animals. In 1969, he decided that the world should have a special day to teach people about how to make environment better. His idea became popular and on 22 April 1970 the first Earth Day was celebrated. Since then, environmentalists have used the day to educate people about their roles in protecting our planet. Earth Day finally became a global celebration around the world. On this day, people come together to talk about global warming, protecting rare animals and saving energy sources. Question 20: Environmentalists have used the Earth Day to ________. A: get people around the world to play together B: carry their research C: ban people from using energy sources D: educate people about their roles of protecting our planet 9 Choose the word whose stressed pattern is pronounced differently from the others. A: pollute B: effect C: litter D: affect 10 Mark the letter A, B, C or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges. Question 13. Nam: How about organizing a Clean Day for our school? Huong: _________. A: Good idea! How should we start? B: Oh yeah! I can’t believe that. C: No. I had no idea about that. D: No problem. We can do. 11 Choose the sentence A, B, C or D that best combines the given sentences. Question 24: There are so many billboards in our city. People cannot enjoy the view. A: If there were many billboards in our city, people could enjoy the view. B: If there were not so many billboards in our city, people could enjoy the view. C: If there were not so many billboards in our city, people couldn’t enjoy the view. D: If there are not so many billboards in our city, people can enjoy the view. 12 Choose the underlined part A, B, C or D that needs correcting. Picture 11 A: A B: B C: C D: D 13 Choose the best answer A, B, C or D to complete the sentence. Question 9: If I _______ you, I ______ volunteer to clean the beach. A: am/ would B: were/ would C: was/ will D: am/ will 14 Choose the best answer A, B, C or D to complete the sentence. Question 12: The polluted water__________ in the death of the fish. A: leads B: causes C: results D: makes

sau chiến tranh thế giới thứ 2 những nguyên nhân khiến nước Mỹ vươn lên chiếm ưu thế tuyệt đối về mọi mặt trong thế giới tư bản??

Các bn vẽ hộ mik 1 anime kèm chữ i love tên bn

what will you find is that you're on your feet all day long, lifting and carrying, so if you not fit now you soon will be ( dịch hộ mk vs nha)

Cho hàm số y = (m+1)x-2 có đồ thị là đường thẳng d a) .tìm m để đồ thị d cắt đồ thị hàm số y = x + 3 tại điểm có tung độ là 2. b) vẽ đồ thị hs tìm dc ở câu a. tính s tam giác tạo bởi đồ thị vs 2 trục tọa dộ làm giúp mình câu b với ạ mình cần gấp,cảm ơn ạ

1/2^2+1/3^2+...+1/100^2 chứng minh < 3/4

Rút gọn biểu thức sau: 17+3a+b+c-3.(a+1/3b+2/3c)