Question

authors claim?
choose 1 answer:
a beavers can have catastrophic effects on an ecosystem, downing trees that provide habitats and food for vulnerable species.
b studies have shown that introducing beavers to an area can improve plant diversity by 25 - 35%.
c beaver dams improve water quality for local species by protecting soil that filters dangerous chemicals from water.
d riparian ecosystems benefit beavers as well, allowing them to access a wider variety of food sources.

Explanation:

Options B, C and D highlight positive impacts of beavers on ecosystems (plant - diversity improvement, water - quality improvement, and food - source access for beavers). Option A presents a negative view of beavers' impact on ecosystems by stating they have catastrophic effects.

Answer:

A. Beavers can have catastrophic effects on an ecosystem, downing trees that provide habitats and food for vulnerable species.