Question

choose a word or phrase to complete each part of the summary for \island rescue.\ santa cruz island is a special place that is home to several unusual species of animals. , until a few decades ago, the island’s ecosystem was threatened by d plants. for example however

Explanation:

The first sentence describes Santa Cruz Island as a special place with unusual animal species. The second - sentence shows a contrast as it mentions the ecosystem was threatened. "However" is used to introduce a contrast. "For example" is used to give an instance, which is not appropriate here as there is no example - giving context.

Answer:

However