Atmospheric carbon dioxide levels are currently higher than they have been during the last 400,000 years
a. true
b. false
Answer: a. true
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The ecosystem in the Everglades National Park was impacted most by:
A. Conversion of adjacent land to agriculture and urban development B. Restricting recreational fishing C. Increased commercial fishing D. Introduction of invasive animal species
Which of the following shows the correct order for a scientific explanation?
A. observation - question - hypotheses - predictions - results of investigation - conclusions B. predictions - hypotheses - results of investigation - question - observation - conclusions C. hypotheses - question - observation - predictions - results of investigation - conclusions
The _______________ of a stream, also known as its channel slope, is its steepness of descent from its highest elevation to its lowest
Fill in the blank with correct word.
Two third-order streams must join to form a second-order stream
Indicate whether the statement is true or false