Một sinh viên khi đếm mật độ tế bào đã biêt được tổng số tế bào là 2,8*10^4 tế bào/ml. Tiến hành pha loãng theo tỉ lêj 1:2 thu được dịch huyền phù là 10ml cấy là 96 giếng còn 90ul. Thể tích dịch huyền phù ban đầu

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.