Question

1. one keystone species is the binturong. it looks similar to a badger or a ferret. native to southeast asia, the binturong plays a crucial role in the stability of its rain forest home. a certain vine forms the rain forest canopy. it forms a barrier that protects the plants and animals below from getting too much sunlight. the vine’s seed cannot germinate until it passes through a binturong’s digestive tract. this process softens the seed so it can grow. without the binturong, the rain forest canopy thins. this allows more sunlight to shine down into the rain forest. the delicate balance of life would be destroyed. the binturong ______ the vine.

a modifies
b aids
c mimics
d reveals

Explanation:

To solve this, we analyze the text: The binturong's digestive tract softens the vine's seed so it can grow. "Aids" means to help, which fits as the binturong helps the vine's seed germinate. "Modifies" implies changing in a non - helpful growth - related way, "mimics" is about copying (not relevant), and "reveals" is about showing (not relevant). So the correct option is B.

Answer:

B. aids