What properties of estuaries make them highly productive areas?
What will be an ideal response?
Estuaries are very productive because they act as nutrient sinks. The abundance of nutrients supports the growth of phytoplankton, algae, and emergent plants, all of which support secondary production in estuaries and elsewhere. Nutrients are trapped in estuaries as a result of nutrient input from the sea and from rivers; adsorption of nutrients onto sinking particles; and the ejection of pseudofeces by benthic filter feeders at the bottom of estuaries.
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Members of the phylum ____ have bilaterally symmetrical larvae but exhibit secondary radial symmetry as adults, usually organized around five rays, or "arms."
a. Hemichordata b. Echinodermata c. Cnidaria d. Arthropoda e. Chordata
In a reversible chemical reaction at equilibrium, the concentration of X (the reactant) is 0.75 mol/L, and the concentration of Y (the product) is 2.25 mol/L. At 25°C, what would be the Keq?
A) 0.33 B) 3.0 C) 1.69 D) 1.50 E) 37.5
The sum total of all the chemical reactions that occur in organisms is called ________
A) hydrolysis B) cellular synthesis C) conservation of energy D) metabolism
Buffers
A. contain salts of weak acids or weak bases. B. release hydrogen ions when a base is added to the solution. C. keep hydrogen ion concentration and pH within a narrow range. D. include phosphate, protein, and bicarbonate systems. E. All of these are correct statements.