False negative is a condition when you got a negative result for a specimen which was positive. To prevent false negative occur, first you need to use golden standard test or a test with high specificity. You can do multiple tests to ensure the specimen is negative and using a positive control to make sure the reagent is still working fine.
I honestly think it is D. Impulses.
The actually speed of sound in water is 1,498, which is closest to 1,500 meters per second.
-Steel jelly
A biotic factor is all of the students in the classroom.
Hope this helps!!
