AP BIOLOGY

Detailed explanation-1: -The first cell is thought to have arisen by the enclosure of self-replicating RNA and associated molecules in a membrane composed of phospholipids.

Detailed explanation-2: -The first cells were probably no more than organic compounds, such as a simplistic RNA, surrounded by a membrane. Over time, as other organic compounds such as DNA and proteins developed, cells also evolved into more complex structures.

Detailed explanation-3: -Evolution of cells refers to the evolutionary origin and subsequent evolutionary development of cells. Cells first emerged at least 3.8 billion years ago approximately 750 million years after Earth was formed.

Detailed explanation-4: -Life is believed to have originated in sea water (also known as earth’s primordial soup) because sea water contained all the essential elements that were required for the origin of first life. Secondly, at the time of origin of life, the ozone layer was not formed, so terrestrial origin of life was not feasible.