25.Ở sinh vật sinh sản hữu tính qua giảm phân của quá trình phát sinh giao tử đực, mỗi tinh bào bậc một cho ra mấy tinh trùng ? (Mức 1) A) 4 tinh trùng C) 2 tinh trùng
B) 3 tinh trùng D) 1 tinh trùng

This is a biological reaction due to a stimulus. i need this quickly !

In trying to determine whether dna or protein is the genetic material, hershey and chase made use of which of the following facts? a) dna contains sulfur, whereas protein does not. b) dna contains phosphorus, whereas protein does not. c) dna contains nitrogen, whereas protein does not. d) dna contains purines, whereas protein includes pyrimidines.

In what ways does the study of human population differ from the study of wildlife ecology