What evidence is there that modern archaebacteria may be most like the hypothesized earliest cells on Earth?
Both archaebacteria and early cells share morphological similarities,
including a membrane-bound nucleus.
Photosynthesis allows both archaebacteria and the earliest cells to harness
energy from the Sun.
Archaebacteria thrive in extreme environments of intense heat or pressure,
and microfossils suggest early life forms lived in volcanic environments.
Archeabacteria can only survive in warm, shallow waters similar to the
primordial seas in which cells evolved on early Earth.