Zoe is studying a mountainous region where a glacier is melting and retreating.
She constructs the timeline shown below to show her prediction of how the
region will change over time.
An arrow labeled time points from left to right, and has labels from 15 years to
115+ years. From left to right, the illustration shovs bare rocks, grasses an
shrubs, small trees, and then a dense, tall forest.
Why are the changes shown in the diagram classified as primary succession, and
not secondary succession? mm
(1 Point)
1
1
-Time
15 vears
35 vears
80 vears
A. The process results in the appearance of a climax community.
B. Many intermediate communities appear before the climax community.
C. The climax community appears after hundreds of years.
D. The process begins with pioneer species growing on bare rock.

The changes shown in the diagram is classified as primary succession not secondary succession because the process begins with pioneer species that grow on bare rock. During the primary succession, the plants and animals first colonize on a barren and lifeless habitat, so these organisms is known as pioneer species.

Primary succession

We can see that there is no animal and plants present on the rocky habitat and after sometime the plant and animals colonize on the bare rock which shows us primary succession not secondary succession so we can conclude that the process begins with pioneer species that grow on bare rocky habitat.

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