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Home Q & A Board Biology-Related Homework Help General Biology
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tempuser tempuser
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6 years ago
Greenhouse gases _____.
 
  a. help keep Earth's surface warm enough for life
  b. are released by natural and human activities
  c. are at higher levels than they were 100 years ago
  d. all of these

Question 2

Carbon is released into the atmosphere by _____.
 
  a. photosynthesis
  b. aerobic respiration
  c. burning fossil fuels
  d. aerobic respiration and burning fossil fuels
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Treygang5Treygang5
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6 years ago
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tempuser Author
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6 years ago
I wanna give this person a hug.
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