AP BIOLOGY

Detailed explanation-1: -Organisms have evolved from simplified shapes to complicated forms. Hence, first genes, then autotrophic prokaryotes, then heterotrophic prokaryotes, then eukaryotes, and then organisms are the sequence of events.

Detailed explanation-2: -Evolution of cells. Present-day cells evolved from a common prokaryotic ancestor along three lines of descent, giving rise to archaebacteria, eubacteria, and eukaryotes.

Detailed explanation-3: -Prokaryotes are underdeveloped cells, undifferentiated organelles with no nuclei. They have circular DNA. It suggests that prokaryotes evolved first while eukaryotes have well defined membrane bound nucleus and cell organelles. The first organisms to evolve on earth were bacteria.

Detailed explanation-4: -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.