Gen có 120 chu kì xoắn có A=35% tổng số nu ,trên mạch 1 có X1=120nu, A1=240nu a)l, M=?
b) số lượng nu mỗi loại của gen của mỗi mạch
c)số lk H2 dc hình thành giữa các cặp A-T trong gen
help !

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).