AP BIOLOGY

Detailed explanation-1: -Correct answer: Explanation: The first species to inhabit an area that has been disrupted are called pioneer species. This is true in both primary and secondary succession. These pioneer species are hardy species that can withstand harsh conditions.

Detailed explanation-2: -The stages of secondary succession are similar to those of primary succession in that pioneer species that arrive in the cleared area slowly give way to a community of intermediate species over many years before a climax community can become established.

Detailed explanation-3: -In primary succession, newly exposed or newly formed rock is colonized by living things for the first time. In secondary succession, an area previously occupied by living things is disturbed-disrupted-then recolonized following the disturbance.

Detailed explanation-4: -Secondary Succession This type of succession is faster because the soil is already in place. In this case, the pioneer species are plants such as grasses, birch trees, and fireweed. Organic matter from the pioneer species improves the soil. This lets other plants move into the area.