(Figure 19

Multiple Choice

(Figure 19.11) Given the results in the figure, what might prevent a tree with large seeds, like a chestnut, from establishing in a forest with high densities of sweet birch seeds, an early-succession species?

A) The sweet birch seeds would germinate and grow faster, crowding out the chestnut saplings.
B) A chestnut seed would never be transported a large distance to the sweet birch forest.
C) Sweet birch seedlings exude chemicals that block the germination of chestnut seeds.
D) Chestnut seeds, being large, are more likely to be attacked by insects than sweet birch seeds.