Question

The introduction of Caulerpa, also known as killer algae, into California was ultimately the result of _______.
a.
hull fouling
b.
the aquarium trade in exotic, nonnative aquatic species
c.
intentional release
d.
an algae farming company

Answer 1

b. the aquarium trade in exotic, nonnative aquatic species

The killer algae (Caulerpa taxifolia) in California is believed to have been introduced via aquarium plants/contents released from the aquarium trade (dumping/release of aquarium material), not by hull fouling or farming.