Early organisms played a role in the accumulation of free oxygen through the process of ____________________
Fill in the blank(s) with correct word
photosynthesis
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Which nation in Southeast Asia remained uncolonized throughout the colonial period?
A) Laos B) Cambodia C) Burma D) Thailand E) Vietnam
Africa is the only region of the world where per capita food production has declined for about the last 50 years
Indicate whether the statement is true or false
The four main Native American culture groups of Poverty Point, Mississippian, Hopewell, and Adena are collectively known as _______ _____ civilizations. Historically, they were located in the eastern half of the United States
Fill in the blank(s) with correct word
Friction between the moving tide wave and the turning Earth acts to ________.
A. increase the free wave speed of the tide wave B. All of the answers are correct. C. slow the rotation rate of Earth and make the tide wave move as a forced wave D. make no difference to Earth's rotation and wave speed