Which option identifies the field of science that supports the interests of the person in the following scenario?
Tina’s family is from South America. When she was growing up, her village experienced a crisis when hundreds of people became sick from a tainted river where the villagers drank, bathed, and dumped their sewage. As an adult, Tina would like to prevent outbreaks like this from happening again.
bacteriologist
epidemiologist
microbiologist
pathologist

Asingle atom of an element has 21 neutrons, 20 electrons, and 20 protons. which element is it? ok o z

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

Will give imagine you are given a mystery element. it is, however, a discovered and known element. you may perform a maximum of two observations or tests to determine its identity. time and money is critical, so you need to prioritize your tests. if you can get by with a single test, you get 100 super-geek points from your research lab team. pick your two tests, number them as #1 and #2, and justify why you think these two will certainly be enough (and why the first might well be enough all by itself.) the available tests are classification into metal, non-metal, or metalloid, count of valence electrons, count of electron shells, atomic radius (error range: +/- 1 pm), electronegativity (error range: +/- 0.1), first ionization energy (error range: +/- 10 kj/mole), melting point (error range: +/- 10 c), and boiling point (error range: +/- 20 c).