Which organisms were the first to produce O2?
What will be an ideal response?
Oxygenic cyanobacteria were the first organisms to produce O2.
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Which of the following statements is true about economic relations between African colonies and their ruling countries?
A. Ports and railroads were built to carry exports of African resources to Europe. B. Water projects served African subsistence farmers. C. Africa became a center of the global economy. D. African laborers were well treated, because labor was in short supply.
The conversion of water from vapor to liquid is the process of
A) convection. B) condensation. C) evaporation. D) saturation.
Edge cities emerged as a consequence of
A) highway construction. B) suburbanization. C) gentrification. D) remanufacturing. E) census classification.
Some coastal landforms are built by sea creatures capable of producing rocklike material called ________.
A) polyps B) clay C) calcium carbonate D) granite E) sand