How does the stomach continue digestion

What do scientists need to look at before developing an argument

Invasive species are one of the major threats to biodiversity. these species multiply quickly and compete with native species for food, sunlight, spac and other resources. on the map, determine the area where native species will have limited resources available to them due to invasion threat from invasive species threat very low low medium high very high

Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine