Which of the following groups of bacteria lives in environments similar to those that may have existed on the early Earth?
A) deeply branching bacteria
B) cyanobacteria
C) mycoplasmas
D) thermophiles
E) proteobacteria

Question

Quizplus · Accepted Answer

Deeply branching bacteria are thought to be some of the earliest forms of life on Earth and live in extreme environments similar to those that may have existed on the early Earth. They are also considered to be a primitive form of bacteria that have not evolved much over time. Cyanobacteria and proteobacteria are both relatively modern bacteria, and mycoplasmas are parasitic bacteria that live in specific hosts, so they do not live in environments similar to those on the early Earth. Thermophiles are heat-loving bacteria, so while they may live in extreme environments, they are not necessarily similar to those on the early Earth.

Which of the Following Groups of Bacteria Lives in Environments