AP BIOLOGY

Detailed explanation-1: -abiogenesis, the idea that life arose from nonlife more than 3.5 billion years ago on Earth. Abiogenesis proposes that the first life-forms generated were very simple and through a gradual process became increasingly complex.

Detailed explanation-2: -The concept of chemical evolution refers to the origin of life from non-living or inorganic matter. The first organic compound was said to have been formed due to the ever-changing environmental conditions of the primitive earth and a combination of inorganic compounds.

Detailed explanation-3: -The theory of chemical evolution says that the complex organic molecules were formed from the simple molecules by the chemical reactions that occurred in the oceans during pre-historic age. This was the first step in the development of life on earth. This theory was based on the experiment done by Miller and Urey.

Detailed explanation-4: -abiogenesis. noun. abio·gen·e·sis ˌā-ˌbī-ō-ˈjen-ə-səs. : the origin of life from nonliving matter. specifically : a theory in the evolution of early life on earth: organic molecules and subsequent simple life forms first originated from inorganic substances.