The Total solution for NCERT class 6-12
Yes, there has been such a situation where different types of parasites and disease-causing micro-organisms would want to be eradicated from the planet. Scientists are working extensively to fight and wipe them out completely as these microbes are harmful to human existence and have been successful in eliminating smallpox from the Earth through the successful use of vaccination which shows how humans deliberately want to make these species extinct. Some other programmes aiming at eradication are for Hepatitis B, polio vaccinations etc to eliminate those microbes that cause diseases.