Biology

The correct answer is: A.Accidental human activities, such as trade and travel.

Invasive species are most commonly introduced to new ecosystems through human activities, often unintentionally. This can happen via international trade, travel, or the movement of goods and equipment. For example, species can hitch a ride on ships, planes, or cargo, or be accidentally released by people into new environments.

Here’s why the other options are incorrect:

B.Natural migration: While species can migrate naturally, invasive species are usually introduced to ne...