The quality of water used for test organism culturing and for dilution water used in toxicity tests is extremely important.
The quality of water used for culturing and dilution is very important.
The quality of water used for culturing and dilution doesn't really matter.
It was my impression that all was normal.
A mother and son read a book together.
Three adults race each other on foot
A man sitting on the couch watching tv as his mom crawls by.
Superman fights a bear
A group of strangers are outside in a city.