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Protostome Animals (Grades 11-12)

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Protostome Animals

Which trait is NOT common among the protostomes?
  1. anterior brain
  2. dorsal nervous system
  3. bilateral symmetry body plan
  4. development of a mouth from a blastopore
Which would NOT be found in a protostome animal with an incomplete digestive tract?
  1. nervous system
  2. endoderm
  3. ectoderm
  4. anus
Some lophotrochozoans have a type of free-living larvae called a                             .
Some wormlike ecdysozoans have a thin exoskeleton called a                     .
Which group of crustaceans looks similar to the mollusks superficially?
  1. isopods
  2. decapods
  3. copepods
  4. barnacles
Which group contains the largest number of species?
  1. rotifers
  2. annelids
  3. arthropods
  4. polychaetes
Why are animals that have a thin cuticle usually restricted to moist habitats?
  1. The cuticle allows water to be lost across the body surface.
  2. There are fewer predators that thrive on these animals in this type of habitat.
  3. Moving water is essential for getting food to these animals.
  4. The sperm of these animals is non-motile so the water carries it to the egg.
Why do animals with exoskeletons need to undergo periodic molting?
  1. Large amounts of food are needed to support the growth of the exoskeleton.
  2. The exoskeleton prevents animals from moving freely in the environment.
  3. The animal is growing inside of the exoskeleton, which does not grow along with it.
  4. The exoskeleton is a major attraction for predators.
Which has NOT been a major part of protostome evolution?
  1. segmentation of the body cavity
  2. parasitism and complex live cycles
  3. improved mechanisms for locomotion
  4. mechanisms for ingesting large prey
Why is the term "cephalopod" a good description for the octopus and squid?

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