Which of the following reagents can be used to reduce a carboxylic acid?
A) sodium borohydride
B) lithium aluminum hydride
C) both a and b
D) neither a nor b
B
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Which region of East Asia is amongst the most densely populated in the world, with a population exceeding 100 million people?
A) Taiwan B) Tibet C) Manchuria D) the Korean Peninsula E) the Sichuan Basin
What is the main difference between a conceptual model and a physical model?
A. Conceptual models can only be used to describe concepts. B. A conceptual model represents the shape and form, while a physical model describes how a system behaves. C. Physical models can only be used to represent the real world. D. A physical model represents the shape and form, while a conceptual model describes how a system behaves. E. Physical models and conceptual models can be used to describe the same things.
Boreal forest has a top layer, or canopy, and two more layers beneath
Indicate whether the statement is true or false.
Most evaporation occurs over the land surface
Indicate whether the statement is true or false