Final answer:
Option D). Biosecurity is practiced more strictly in aquatic animals compared to other species due to their ability to spread diseases and parasites through water.
Step-by-step explanation:
Biosecurity is practiced more strictly in aquatic animals compared to other species. This is because aquatic animals, such as fish and shellfish, can easily spread diseases and parasites through water, which makes it important to have strict biosecurity measures in place to prevent the spread of pathogens. For example, in aquaculture, biosecurity protocols like regular testing, disinfection of equipment, and strict control of water sources are implemented to prevent the introduction and spread of diseases.