analysis
analyzing
biochemistry
biotechnology
bottle
bottled
chemical
chemist
chemistry
clean
confused
contaminated
contamination
control
discovery
doctor
drink
examining
experiment
expertise
filtered
fresh
healthcare
lab
laboratory
liquid
man
medical
medicine
microbiology
microscope
pollutant
pollution
puzzled
quality
research
researcher
sample
scared
scientific
scientist
student
studying
substance
surprised
test
testing
toxic
virus
water