The Precambrian time refers to the time 4.5 billion to 542 millions year ago. This period is characterized by having reduced atmosphere and included reduced compounds. Scientists believed that atmosphere at that time was devoid of free oxygen and CO2 was present in excess. Before the complex life evolved on the Earth, the Precambrian Earth's ocean contained dissolved carbon dioxide.
In plants the reproductive structure that produces pollen and seeds is the xylem is the answer
DNA helicase untwists the helix at the replication origins. Then the DNA is seperated into a "Y" shape called the replication fork.
I am sorry I just wanted points for my answer and I am sorry again I needed points
Because the common cold is cause by a ‘virus’.......
The answer is VIRUS
