Thụ tinh là gì ? Tại sao sự kết hợp ngẫu nhiên giữa các giao tử đặc và giao tử cái lại tạo được các hợp tử chứa các tổ hợp NST khác nhau về nguồn gốc ?

1. cos 2x 5 sin.x+2=0 2. cos2x –3.cosx =1 3. 2 sinx-cos²x-2=0 4 cos2x-4 sin²x-1=0 40 điểm ạ,Ai giải nhanh em cho 5 sao và cảm ơn ạ,đang gấp lắm ạ.Em cảm ơn ạ

Bạn có thể làm gì góp phần xây dựng nếp sống văn minh,lịch sự trong trường học ?

nêu tên tác giả, phương thức biểu đạt, PTBĐ chính, kiểu văn bản, hệ thống nhân vật, tên văn bản [ giải thích tên] sự việc chính xoay quanh nhân vật, nội dung và nghệ thuật các văn bản cổng trường mở ra , mẹ tôi, cuộc chia tay của những con búp bê

Giup em 3 cau nay a, 15p thoi.. Em cam on

giúp em với em cần gấp 2.This book is not mine. It’s ……….. than my book.(old) 2 điểm 1. My school is ………….from her school. It’s bigger.(differ) 2 điểm 3.I won the..........place in the competition(one)

1. Đặt câu lệnh có trạng thái: - Thời gian chỉ - Chỉ địa điểm - Chỉ nhân nguyên - Chỉ mục tiêu - Chỉ phương thức - Chỉ cách thức 2. Đặt 2 câu lệnh có khởi ngữ gián tiếp và 2 câu lệnh có khởi ngữ trực tiếp

28. People think that he was born in a rich family. A. That is thought he was born in a rich family. B. He was thought to be born in a rich family. C. That he was born in a rich family is thought. D. He is thought to have been born in a rich family. 31. They said that the president had arrived in the city. A. The president was said to have arrived in the city. B. It is said that the president had arrived in the city. C. The president was said to arrive in the city. D. It was said that the president arrived in the city. 32. He expects that his father will come back home. A. It was expected that his father will come back home. B. His father was expected to be come back home. C. His father will be expected to come back home. D. His father is expected to come back home. 33. Further tests / going / done / drug / soon A. Further tests are going to done on the drug soon. B. Further tests are going to do on the drug soon. C. Further tests are going to be done on the drug soon. D. Further tests are going to be done the drug soon. 34. This book / ought/ read/ on the spot. A. This book ought be read on the spot. B. This book ought to been read on the spot. C. This book ought to be read on the spot D. This book ought to have been read on the spot. 35. We / believe/ human life / can/ prolong / drug. A. We believe that human life can prolong by the drug B. We believe that human life can be prolonged by the drug. C. We believe that human life could be prolonged by the drug. D. We are believed that human life can be prolonged by the drug. 36. Our plan / might / cancel / due / lack of funds. A. Our plan might be cancelled due to lack of funds. B. Our plan might be cancel due to lack of fund C. Our plan might cancelled due to lack of funds D. Our plan might cancel due to lack of funds. 37. This car / need / wash / before / I / use / tomorrow. A. This car needs to washed before I use it tomorrow B. This car needs to be washed before it is used tomorrow. C. This car needs washing before it uses tomorrow. D. This car needs to be washing before it is used tomorrow.

Một vật rơi tự do từ độ cao 20m. Cùng lúc đó một vật khác được ném thẳng đứng xuống từ độ cao 32m với vận tốc đầu V0 hai vật chạm đất cùng lúc. Tìm v0

calli : good morning NL : chào buổi sáng mọi người