Biology

The correct answer is: B.Secondary succession.

In the case of the Mt. St. Helens eruption, the eruption covered the land with ash and debris, but the key detail is that soil remained intact. Although the eruption caused massive destruction of plant life, the soil and some organic material were still present beneath the ash. This allows for secondary succession to take place, as the recovery process begins in an area where the soil has not been completely removed.

Here's why secondary succession applies:

Secondary succession occurs when a disturbance, like a volcanic eruption, fire, or logging, disrupts the existing ecosystem but leaves the soil intact. In this case, whi...