he first photosynthetic organisms to oxygenate the Earth’s atmosphere and trigge

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

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