During the 1900s, the following genetic discoveries were made: DNA is the molecule responsible for inheritance.

There are four bases in DNA, and they combine in a specific way. Adenine pairs with thymine, and guanine pairs with cytosine.

DNA is a double helix. The sugar molecules form the backbone, and the bases are connected by hydrogen bonds in the middle.

Enzymes that can cut and copy sections of DNA are identified and isolated.

There are four bases in DNA, and they combine in a specific way. Adenine pairs with thymine, and guanine pairs with cytosine.

Explanation:

hello which   of the following there is nothing!

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.