Shells constructed from seawater incorporate the 18O/16O ratio of seawater during their lifetime within their CaCO3 shell walls, providing a paleothermometer that is used to estimate the temperatures of ancient seas.
Answer the following statement true (T) or false (F)
True
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At room temperature, which combination of reactants is commonly used to synthesize amides?
A) an amine and an anhydride B) an amine and an alcohol C) an amine and a carboxylic acid D) None of these, amides cannot be synthesized at room temperature.
By 2020, all of the following will have moved into the top three leading causes of disease worldwide except
A. pneumonia. B. heart disease. C. traffic accidents. D. depression.
The modern U.S. environmental movement began as a
A) partisan effort but now has broad bipartisan support. B) partisan effort that remains partisan and highly contested today. C) broad bipartisan effort that remains in effect today. D) broad bipartisan effort but has fractured into a contentious partisan debate with intense lobbying.
The carbon cycle is an example of how materials are cycled through ecosystems.
Answer the following statement true (T) or false (F)