Question

the tsunami that struck asia in 2004 caused widespread damage.
which abiotic change had the biggest impact on local ecosystems?
○ the destruction of crops being raised on farmland
○ soil contamination and destruction of microorganisms by saltwater
○ survival of many coconut palm trees that could provide forage
○ introduction of many new species of fish that competed with local species

Explanation:

First, define abiotic factors: non-living components of ecosystems.

1. Crop destruction involves biotic (crops) and agricultural systems, not an abiotic change.
2. Saltwater contamination of soil is an abiotic change (saltwater is non-living) that directly alters soil chemistry, destroys critical soil microorganisms (a biotic component dependent on abiotic conditions), and disrupts the base of terrestrial ecosystem nutrient cycles, with long-term, widespread impacts on plant growth and ecosystem function.
3. Survival of coconut trees is a biotic response, not an abiotic change.
4. Introduction of new fish species is a biotic change, not abiotic.

Answer:

B. soil contamination and destruction of microorganisms by saltwater