A) The larval form is flagellated and able to swim to a suitable location.
B) Classification is based on the type of skeletal material.
C) They resemble a colony of flagellated cells more than a multicellular animal.
D) Specialized stinging cells are used to help capture prey.
E) Reproduction can be sexual or asexual.
G) A) and E)
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A) are both radially symmetrical.
B) both have three germ layers.
C) both have the sac body plan.
D) are both deuterostomes.
E) are both found in freshwater.
G) A) and E)
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A) a solid ventral nerve cord
B) a variety of respiratory organs
C) a well-developed nervous system
D) jointed appendages and a segmented body
E) All of the answer choices describe features of arthropods.
G) D) and E)
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A) molluscs
B) echinoderms
C) arthropods
D) annelids
E) chordates
G) A) and B)
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1. A rigid but jointed exoskel...View Answer
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A) Ticks and mites are often parasitic.
B) Spiders and scorpions are predators.
C) Spiders have trachea for respiration.
D) Spiders have a pair of fangs which release poison.
E) The body parts include a cephalothorax and an abdomen.
G) All of the above
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A) proglottids
B) scolex
C) cyst
D) gastrovascular cavity
E) nematocyst
G) D) and E)
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1. Molluscs contain a visceral mass that...View Answer
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A) active predators.
B) sessile or relatively inactive.
C) always herbivorous.
D) classified as cnidarians.
E) classified as gastropods.
G) A) and C)
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A) corals
B) planaria
C) sea anemones
D) hydrozoa
E) Portuguese man-of-war
G) A) and E)
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A) having a spiny skin.
B) having three germ layers.
C) possessing a notochord.
D) the second embryonic opening becoming the mouth.
E) the coelom forming by outpocketing of the primitive gut.
G) D) and E)
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A) The exoskeleton is made up of bony tissue.
B) Gas exchange occurs through gills on the skin.
C) Larvae are free-swimming and bilaterally symmetrical.
D) A water vascular system allows the tube feet to produce suction.
E) Symmetry is radial in the adult, usually with parts in fives or multiples of five.
G) D) and E)
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A) insects.
B) snails.
C) clams.
D) earthworms.
E) scorpions.
G) B) and D)
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