What do squid use as a decoy defense mechanism?
a. Cnidoblasts
b. Internal shells
c. Coagulated ink
d. Propulsion
ANS: C
Octopus and squid have a sack of coagulated ink inside their bodies. They are able to eject the ink,
duplicating its relative size and shape in the water. Information can be found in the section Advanced
Invertebrates Have Complex Bodies and Internal Systems.
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With the rising temperatures of gases, atoms dissociate to become
A. plasmas. B. vapor. C. white hot. D. none of the above
Which of the following processes are unidirectional global changes?
a. The evolution of the solid Earth and life b. The evolution of the atmosphere and oceans c. The evolution of the supercontinent cycle d. Both b and c e. Both a and b
Zooplankton populations in Lake Erie and the Hudson River have declined by up to 70% or more since the arrival of zebra mussels because ________
A) zebra mussels feed on cyanobacteria, which zooplankton need as a food source B) zebra mussels carry a parasite that kills zooplankton C) zebra mussels prey on zooplankton D) waste from zebra mussels promotes bacterial growth that kills zooplankton E) zebra mussels block sunlight penetration into lakes and thus prevent zooplankton from photosynthesizing
The leading cause for migration to the United States and Canada has been
A) freedom from religious persecution. B) avoiding harsh environmental conditions. C) forced migration. D) economic opportunity. E) fleeing dictatorial governments.