Hull fouling is a(n) introduction of nonnative species.
a. unintentional
b. intentional
c. unimportant
d. land-based

a. Unintentional

Hull fouling is a phenomena which refers to the transfer of biological species such as plants and animals from their native habitat to other location. This mainly occurs during voyage the ship hull takes away aquatic plants and animals along with it. These organisms can also be dislocated by application of fishing net and some of the organisms are transferred from one location to the other. The introduction of non-native species is unintentional. These non-native species can be invasive to the species residing in the new habitat.

the answer is d. chordata

youre right there are