he first photosynthetic organisms to oxygenate the Earth’s atmosphere and trigge
ID: 316890 • Letter: H
Question
he first photosynthetic organisms to oxygenate the Earth’s atmosphere and trigger a mass extinction were:
Select one:
a. Land plants
b. Green algae
c. Cyanobacteria
d. Purple sulfur bacteria
e. Methanogens
Which of the following is absent in some kinds of living cells?
Select one:
a. cytoplasm
b. cell membrane
c. ribosomes
d. nucleus
e. phospholipids
Observations used as scientific evidence should NOT include
Select one:
a. peer-reviewed scientific literature.
b. previous data generated.
c. observations about past work.
d. anecdotal evidence.
e. other people’s data.
Explanation / Answer
The cyanobacteria is responsible for the great oxygenation events
the red blood cells lack nucleus
anecdotal evidence little stories or hearsay would not be qualified as scientific evidence