About 3.5 billion years ago when life first started to develop, the atmosphere of the earth was likely to have
A) been an oxidising atmosphere.
B) had low levels of UV light.
C) had little ozone.
D) been aerobic.
E) only low levels of oxygen.
Correct Answer:
Verified
Q1: Compared to eukaryotes, prokaryotes
A) do not have
Q2: One piece of evidence for the common
Q3: Cellular structures to surround the cytoplasm evolved
Q5: Compared to the modern age, conditions in
Q6: Early bacteria probably obtained their energy by
A)
Q7: A phylogenetic tree of the evolutionary relationships
Q8: Prokaryotes can be divided into two major
Q9: Using modern techniques for sequencing DNA/RNA, cellular
Q10: Penicillin and cephalosporins are effective antibiotics because
Q11: A common reference system for classifying bacteria
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