1 pts Motivation for scientific study of national park systems include:

Estimation of ecosystem services

Opportunity to study rare forms

o

Baseline comparisons to other systems

None of these answers is correct

All these answers are correct

Which of the following statements best describes what is occurring in the land surrounding the sahara desert? a desertification is increasing, and the desert is expanding. b. fewer people are trying to farm in this semiarid region. c. the desert is shrinking with the increased use of irrigation. d. increased urbanization has resulted in decreased deforestation. select the best answer from the choices provided mark this and return save and exit next submit