1.  Define the following  terms:
    a.  alien species

    b.  control

    c.  ecosystem

    d.  introduction

    e.  invasive species

    f.  native species

    g.  species

2.  Aliens in the U.S./America
    a.  What is the number of non indigenous plantsresiding in the U.S.?

    b.  What is the number of non indigenous animalsresiding in the U.S.?

    c.  How do alien species arrive in the U.S.?

    d.  Are all non-native species undesirable?

3.  How much do invasive species cost the U.S. annually (yearly)? __________
           weeds__________
           insects__________
               rats__________
      mongoose__________

4.  How are ecosystems transformed by invasive species?
 
 

5.  What are three hard-hit ecosystems in the U.S.?
    a.
    b.
    c.

6.  What are synonyms for the word, exotic?