Based on embryo studies, blood proteins, and biochemistry of muscle activity, chordates may be more closely linked to echinoderms than to other phyla
Indicate whether the statement is true or false
True
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Which of the following is not composed of calcium carbonate?
A) Calcite B) Pyrite C) Marble D) Shells E) Limestone
Atmospheric brown clouds are ____.
A. large clouds of dust, smoke, soot, and toxic metals B. primarily found in Western Europe C. slow moving clouds from wildfires D. only a problem in China E. produced by volcanic eruptions
Kilauea, a volcano in Hawaii, generates fluid, extensive lava flows. Mount St. Helens, a volcano in Washington State, can produce lava flows that are short and thick, but that can also erupt violently and generate large volumes of ash
What might these differences indicate about each lava's silica content and temperature? What will be an ideal response?
Which ester is formed by the reaction of CH3CH2COOH and CH3CH2OH?
A) ethyl acetate B) ethyl propanoate C) propyl acetate D) none of these