Multiple Choice
Large amounts of oxygen gas first appeared in Earth's atmosphere about ________ of years ago.
A) thousands
B) millions
C) billions
D) hundreds
Correct Answer:

Verified
Correct Answer:
Verified
Q8: Photosynthetic organisms are _.<br>A)producers that make all
Q9: <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB7803/.jpg" alt=" -The figure above
Q10: Glycolysis results in _.<br>A)the production of CO<sub>2</sub><br>B)the
Q11: A process is referred to as aerobic
Q12: The ultimate source of energy in food
Q14: Which statement is an accurate comparison of
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Q18: <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB7803/.jpg" alt=" -Examine the figure