An environmental scientist collects water samples from streams and rivers near largeindustrial plants and saves exactly 1 liter of water from each sample. Then, back at the lab,the researcher determines the amounts of certain health-jeopardizing bacteria in eachsample. What measurement scale does the measurement of bacteria content reflect?

Stuart designed and built a water filter in class. He wants to know if it will make water from lakes or streams safe to drink. Which of the following would it be best for Stuart to measure in an experiment in order to test his design and answer this question? A. the amount of time required for different volumes of water to pass through his filter B. the diameter of the largest grain of dust, dirt, or sand that can pass through his filter C. the amount of bacteria and impurities in water both before and after it passes through his filter D. the maximum force that can be applied to his filter without breaking it

A sample taken from a sewage treatment plant is likely to have too many bacteria to count directly. What would be best done when determining the numbers of viable bacteria in the sample? Group of answer choices Filtration then spread plating the filtrate Serial dilution and spread plating the dilutions 16-streak plating of the wastewater sample All of the other answer choices are correct Optical density reading in a spectrophotometer

Explain how we measure growth and count microbesCompare and contrast the different methods

Scientists investigated the effectiveness of different disinfectants on the growth of bacteria.The diameter of the clear area around one of the disinfectants is 9.2 mm.Calculate its cross-sectional area._____ mm2Write your answer to 1 decimal place.

Which scale of measurement is the most informative?