Final answer:
Mosquitoes are the order of insects responsible for the most human deaths every year, primarily through the spread of malaria, which causes at least a million fatalities annually.
Step-by-step explanation:
The order of insects responsible for the most human deaths every year is mosquitoes. These insects are notorious for spreading deadly diseases like malaria, which alone accounts for at least a million deaths annually, predominantly affecting African children. Despite advancements in disease control and prevention, mosquitoes continue to pose a significant threat to global health, spreading not only malaria but also other illnesses like the West Nile virus.
It is important to remember that insects play various roles in human life, from being pests that consume crops to essential pollinators necessary for many of our food plants. However, when considering the impact on human mortality, the negative aspects of certain insects, particularly disease-carrying mosquitoes, are of significant concern.
Efforts to reduce the toll of mosquito-borne diseases involve treatments and preventative measures like mosquito nets and spraying insecticides, but a comprehensive preventive vaccine for malaria is still under development.