Deforestation has……………
a) positive effect
b) negative effect
c) both a and b
d) none of these
Deforestation has dramatic impact is………….
a) loss of habitat
b) los of water
c) loss of oxygen
d) all of these
….percent of the earth land animals and plants live in forests.
a) 70
b) 34
c) 12
d) 38
How many stages of lithoseres.
a) 3
b) 4
c) 7
d) none
Stages of lithoseres include……………………
a) moss stage
b) herb stages
c) shrubs stages
d) tree stages
e) all of these
Properties of population include……………….
a) population density
b) population size
c) patterns of dispersion
d) demographics
e) all of these
