After reading the paragraphs below, answer the questions that follow.
Introduced species are a problem all over the world, and there are many examples in the United States. Several years ago, a fisherman caught a northern snakehead fish in a pond in Crofton, Maryland (a suburb of Washington, DC). It was suspected that the fish in the Crofton pond were purchased locally and then intentionally released. Snakeheads are top predators, and 90% of the northern snakeheads' diet consists of other fishes. The northern snakehead can breathe out of water and travel short distances (about 100 feet) across land. They also breed rapidly. Females can lay more than 100,000 eggs per year. Juveniles have also been identified in the Potomac River and other rivers in Pennsylvania.
When snakeheads enter aquatic ecosystems, biodiversity in these ecosystems would most likely
◦ remain the same, because the snakeheads will merge without problems into established communities.
◦ increase, since another species has been added to the environment.
◦ decrease, since the snakehead will prey on native species.
◦ remain the same, since local species will prey on the snakeheads and remove them.
Species richness increases with island size.
These species are all at risk of extinction.
Several species of squirrels have melanistic phases. In large parts of United States and Canada, the
The chain of infection: preventative measures follow each link of the chain.
A beam-type torque wrench that displays the torque reading on the face of the dial. The beam display ...
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