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Animal life became possible on Earth after -
oxygen was generated through photosynthesis
photosynthesis of plants
21% oxygen, 78% nitrogen, and 1% other
carbon dioxide
90N
11,400 years old
longitude
latitude
Which of these correctly shows Earth's atmospheric composition?
oxygen was generated through photosynthesis
photosynthesis of plants
21% oxygen, 78% nitrogen, and 1% other
carbon dioxide
90N
11,400 years old
longitude
latitude
The visible lines on a map or graph that extend left to right are called:
oxygen was generated through photosynthesis
photosynthesis of plants
21% oxygen, 78% nitrogen, and 1% other
carbon dioxide
90N
11,400 years old
longitude
latitude
The visible lines that extend up and down on a globe or map are called:
oxygen was generated through photosynthesis
photosynthesis of plants
21% oxygen, 78% nitrogen, and 1% other
carbon dioxide
90N
11,400 years old
longitude
latitude
Human activities (transportation, factories, etc.) are responsible for the INCREASE of which of these gasses?
oxygen was generated through photosynthesis
photosynthesis of plants
21% oxygen, 78% nitrogen, and 1% other
carbon dioxide
90N
11,400 years old
longitude
latitude
Where did the oxygen in Earth's atmosphere come from?
oxygen was generated through photosynthesis
photosynthesis of plants
21% oxygen, 78% nitrogen, and 1% other
carbon dioxide
90N
11,400 years old
longitude
latitude
A bone sample contains only 1/4 of its original radioactive C14 content. The half-life of C14 is 5700 years. What is the age of the bone sample?
oxygen was generated through photosynthesis
photosynthesis of plants
21% oxygen, 78% nitrogen, and 1% other
carbon dioxide
90N
11,400 years old
longitude
latitude
Which of the following is the correct latitude of the North Pole?
oxygen was generated through photosynthesis
photosynthesis of plants
21% oxygen, 78% nitrogen, and 1% other
carbon dioxide
90N
11,400 years old
longitude
latitude
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