Answered

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1. When do pioneer species arrive during primary succession?
A. Last ones to appear in an ecosystem with no soil present
B. First ones to appear in an ecosystem with no soil present
C. Appear in an ecosystem during the middle of primary succession
D. Appear in an ecosystem during the middle of secondary succession

Sagot :

Parrain

Answer: B. First ones to appear in an ecosystem with no soil present

Explanation:

Primary succession is the process of claiming a previously barren area for living organisms. The area would have no soil and would just be full of rocks having been recently unearthed as a glacier retreated or a lava flows cooled down.

Pioneer species are the first to appear in such an environment. They are able to live on the rocks and sustain themselves. In time, they break down the rocks into soil so that plants are able to grow. Examples of such species include lichens and fungi.

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