EVERYDAY SCIENCE

Detailed explanation-1: -Prokaryotes were the earliest life forms, simple creatures that fed on carbon compounds that were accumulating in Earth’s early oceans. Slowly, other organisms evolved that used the Sun’s energy, along with compounds such as sulfides, to generate their own energy.

Detailed explanation-2: -The first life on Earth began more than 3.8 billion years ago with individual cells that did not contain nuclei, known as prokaryotes. These first living cells were heterotrophs, meaning that they were dependent on external nutrition sources.

Detailed explanation-3: -The first cells were most likely primitive prokaryotic-like cells, even more simplistic than these E. coli bacteria. The first cells were probably no more than organic compounds, such as a simplistic RNA, surrounded by a membrane.

Detailed explanation-4: -Prokaryotic cells are single-celled microorganisms known to be the earliest on earth. Prokaryotes include Bacteria and Archaea. The photosynthetic prokaryotes include cyanobacteria that perform photosynthesis.

Detailed explanation-5: -The first life on Earth was prokaryotic. Prokaryotic cell structure is much simpler. The domains Archaea and Bacteria are both prokaryotic, and evidence suggests that Archaea are most like the earliest prokaryotes.