arab
analysis
analyzing
arabian
arabic
biotechnology
bottle
chemical
chemist
chemistry
clean
contaminated
contamination
desalinated
desalination
ecology
environment
examining
experiment
expertise
filtered
glass
lab
laboratory
liquid
man
medical
microbiology
microscope
muslim
pee
pollutant
pollution
quality
research
researcher
sample
saudi
science
scientific
scientist
student
test
testing
tests
toxic
tube
urinalysis
urine
water