Which of the following gases was NOT part of Earth's original atmosphere?
a. oxygen
b. nitrogen
c. water vapor
d. carbon dioxide
a. oxygen
Environmental & Atmospheric Sciences
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What physical factor can denature or alter a proteins structure in a cell?
a. Phosphorus b. Nitrogen c. Light d. Salinity
Environmental & Atmospheric Sciences
Which layer of the planet forms 80 percent of Earth's total volume, and has an average density of 4.5 grams/cm3?
A) continental crust B) oceanic crust C) mantle D) core
Environmental & Atmospheric Sciences
Despite a fast growing population, urban growth has remained slow as few Africans choose to leave the rural areas
a. True b. False Indicate whether the statement is true or false
Environmental & Atmospheric Sciences
Nutrients and carbon dioxide are limiting factors for the success of phytoplankton
a. True b. False
Environmental & Atmospheric Sciences