The circulatory system in the earthworm
A) is absent.
B) is an open type.
C) uses the dorsal vessel as the main pumping organ.
D) has no pumping structure and depends on the action of body muscles to move the blooD.
Correct Answer:
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Q18: Errantia differ from other annelids because errantia
Q19: Annelids grow by producing new segments at
Q20: The Errantia
A)belong to the smallest and most
Q21: Leeches
A)are found mainly in fresh water.
B)may be
Q22: Reproduction in the earthworm involves
A)asexual budding.
B)self-fertilization.
C)cross-fertilization between
Q24: _ is called the "fat innkeeper" because
Q25: Echiurans
A)live in fresh water.
B)have a proboscis used
Q26: Most annelids possess tiny bristles called _.
Q27: The paired appendages used for locomotion in
Q28: Some typical leech characteristics are as follows:
A)anterior
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