How do pioneer species make ecological succession possible on an island formed from a volcanic eruptions

1-they use chemicals to produce food.

2-they establish homes in which animals can live.

3-they break down rock into soil in which plants can grow

4-they adjust the climate by altering the average temperature in region

The correct option is 3. they break down rock into soil in which plants can grow

Explanation:

When a disaster is such huge that even the soil and organic matter get removed from the place, then the succession that will occur in such kind of place will be termed as primary succession. For example, a volcanic eruption or an earthquake.

On the other hand, if after a disaster some of the organic matter remains on the land, then the succession that will occur will be termed as secondary succession. E.g a succession after fire

In primary succession, the pioneer species will be plants that require less soil such as the lichens. The lichens will break down the rocks into the soil and eventually new species of plants will start to grow on the land.

he is very short, and he can only reach halfway up on the elevator buttons. but on a rainy day, he has his umbrella with him, and he uses it to poke the button at the top.

the correct answer is:

a population changes in response to a change in the environment.