Origin and Distribution

New Zealand mud snails are a problem because they compete for space and food of native species and may cause the decline in recreational fish such as trout.
  True
  False

Transportation

New Zealand mud snails are easily spread because:
  A. being small they are not easily detected.
  B. they can survive out of water for several days.
  C. they can survive a wide range of temperatures and salinities.
  D. they can live in silted water or clear mountain streams.
  E. All of the above.

Environmental Impact

Outside of New Zealand the mud snail is a problem because it has no predator or parasite to control its growth rate.
  True
  False  

Economic Impact

New Zealand female mud snails can ______________.
  A. reproduce by cloning.
  B. produce 20-120 offspring at one time.
  C. range in size from a pepper grain to about 5mm.
  D. form very dense colonies.
  E. All of the above.

Control

The green crab can produce up to 300,000 eggs at a time.
  True
  False