Zebra mussels reproduce extremely fast and can travel from place to place easily by attaching themselves to boats. Some experts consider them to be the most harmful invasive species ever to enter the United States.
Which transition would BEST combine these two sentences into one coherent sentence?

A) Otherwise
B) Therefore
C) Conversely
D) In contrast

B

Explanation:

Therefore is the best transition for combining these two sentences. It indicates a conclusion to the ideas expressed in the first sentence: "Zebra mussels reproduce extremely fast and can travel from place to place easily by attaching themselves to boats, therefore some experts consider them to be the most harmful invasive species ever to enter the United States."

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