The processes that determine world's current biodiversity are

a. extinction and speciation

b. endemism and climate change

c. allopatric and sympatric speciation

d. breeding and ecotourism

e. mutation and cleavage

Secondary succession ...

a. occurs after a fire or flood

b. occurs after a volcano spreads lava across a landscape

c. typically begins with lichen colonizing rock

d. is very predictable because it always ends in the formation of a climax community

e. requires primary succession to precede it