The phylum Annelida contains:
A. freshwater oligochaete worms
B. marine polychaete worms
C. earthworms
D. leeches
E. all of the choices provided
E. all of the choices provided
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What is the route of water in the water vascular system of a starfish?
A. Water enters through the madreporite into the ring canal and from thence into the radial canals to the ampullae and finally into the tube feet. B. Water enters the madreporite into the radial canals and from thence into the ring canal, then the ampullae and finally into the tube feet. C. Water enters the madreporite into the ampullae and from thence into the ring canal, then the radial canals to the ampullae and finally into the tube feet. D. Water enters the ampullae and then goes to the tube feet and from thence to the radial canals, then the ring canal, and finally exits through the madreporite. E. Water enters the ring canal, then goes into the radial canals, and finally through the madreporite to the ampullae and tube feet.
Which of the following elements is considered an essential micronutrient for plants?
a. gold b. carbon c. uranium d. nitrogen e. copper
The eleven pairs of appendages projecting from the rostral area of star-nosed moles are _____
A) chemosensory structures B) tactile structures C) olfactory structures D) gustatory structures
A purpose of the plasma membrane is to:
A) produce proteins. B) keep harmful substances within the cell. C) form the outer boundary of a cell. D) form ribosomes. E) allow no contact with other cells.