Shrub vegetation refers to
A) low shrubs and grasses with some adaptations to semiarid conditions.
B) woody plants with small, leathery evergreen leaves.
C) drought resistant.
D) a plant that survives seasonally unfavorable conditions underground.
Question 2
Of the following greenhouse gases, which have actually decreased in atmospheric concentrations during the past 30 years?
A) Chlorofluorocarbons (CFCs) B) Nitrous oxides (N2O)
C) Methane (CH4 ) and carbon dioxide (CO2 ) D) HFCs
