The Long-Term Ecological Research sites (LTER) collectively focus ...

[fasfsadfdsfa]

The Long-Term Ecological Research sites (LTER) collectively focus on studying
 
  A) natural successional changes in ecosystems.
  B) the effects of various types of human disturbances to ecosystem function.
  C) how to make invasive species profitable for agriculture.
  D) the creation of artificial soils for ecosystems lacking producers.

Question 2

Blood lead levels in children between 1996 and 2012 have
 
  A) increased steadily despite EPA and CDC programs to eliminate lead from the environment.
  B) continued to decrease as exposure to lead has been reduced.
  C) remained about the same.
  D) increased in rural areas but declined in urban areas with heave vehicular traffic.

[aham8f]

Answer to Question 1

B

Answer to Question 2

B

[fasfsadfdsfa]

Thank you

[aham8f]

Happy to help you