The phoronid circulatory system:
A) is a closed system but lacks a heart.
B) has hemoglobin dissolved in the plasma.
C) is an open system with pulsatile organs circulating the hemolymph.
D) is an open system with no heart and is dependent upon the hemoglobin enclosed in nucleated cells.
E) is missing and all food and wastes readily diffuse through the lophophore.
Correct Answer:
Verified
Q10: The _ is the secreted body wall
Q11: The digestive system of a phoronid worm
Q12: Reproduction and development in phoronid worms involves
A)monoecious
Q13: How can you distinguish an ectoproct from
Q14: Entoprocts
A)are mostly freshwater.
B)are wormlike.
C)have an incomplete digestive
Q16: Ectoproct colonies have modified zooids to
A)assist in
Q17: The _ includes the lophophore,digestive tract,muscles,and nerve
Q18: Which is NOT a correct description of
Q19: Brachiopoda
A)are called bryozoans.
B)have a mantle and two
Q20: Statoblasts are usually formed
A)in the winter.
B)in the
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