according to criteria such as salinity, depth, and whether the water is flowing or standing
I believe this would be true
Breast cancer research has no impact outside of a lab.
But today in my own opinion breast cancer has started movements and now more cancers are out here today and there are no cures, so people are now investing more money to scientists to find treatments, and also scientists now don't have the solution to everybody's problems and this is causing distress to people.
I do believe the answer is c
What do you mean by "What is a shooting star, a comet or a meteor burning in our Earth’s Atmosphere?"
edit: ohhhhh you are asking what a shooting star is...
its particles of comets or astoroids/metor enter the atmosphere at very high speeds and burn up