_____ are a public health hazard and nuisance because they foul ...

[nramada]

_____ are a public health hazard and nuisance because they foul cars, statues, buildings, and sometimes people with their droppings.
 
  a. Sparrows
  b. Brown tree snakes
  c. Pigeons
  d. Hydrilla

Question 2

Approximately _____ bird species have been introduced into the United States. Of these, less than _____, including chickens, are considered beneficial species.
 
  a. 1000, 10
  b. 100, 10
  c. 25, 2
  d. 25, 25

[enass]

Answer to Question 1

b

Answer to Question 2

d

[nramada]

Thank you!

[enass]

Always glad to help...