Question

vertical layers

1. a tropical rainforest is a realm of layers upon

layers, each one more intriguing than the other. each
vertical layer of vegetation features its own distinctive
flora and fauna, that is, plant and animal life.

the emergent layer

1. the tallest trees of the tropical rainforest are found here.

growing as tall as 200 feet and with trunks as wide as 16
feet in circumference, they poke high above the canopy.

the canopy

1. canopy is the thick roof of the tropical rainforest. the

biodiversity of animals is the highest in the canopy.
animals like monkeys, lizards, birds, tree frogs, and
sloths complete their life cycles here, never once leaving
the canopy. this biodiversity is due to the fact that about
80% of the sunlight is absorbed by the canopy, leaving the
layers below with very little to get by.

the understory and floor

1. for this reason, the understory and forest floor are not as

rich in animal life as the canopy. however, the warm
temperatures and humidity in these layers are just right

the author organizes the article by—
a comparing the different layers of the tropical
rainforest
b describing the different layers of the tropical
rainforest
c identifying the fauna and flora found in the
tropical rainforest
d describing the climate of different segments of
the rainforest

Explanation:

The article has sections titled "Vertical Layers", "The Emergent Layer", "The Canopy", "The Understory and Floor", where it describes each layer of the tropical rainforest. Option A is about comparing layers (no comparison is done, just description), Option C focuses on only flora and fauna (the article also describes the layers' characteristics beyond just flora/fauna), Option D is about climate of segments (the article is about layers, not climate segments). So the author organizes by describing the different layers.

Answer:

B. describing the different layers of the tropical rainforest