6. when conducting experiments, scientists use to guide their processes. 7. the is the one factor that can be manipulated by the experimenter. 8. scientists use a form of shorthand called to express very large or very small numbers. 9. most scientific studies and experiments use a standard system of units called

6. I believe the answer is: Scientific Method
Scientific Method is the process of acquiring a new knowledge by using observations, empirical method and generally acceptable measurements.
The purpose of the usage of a scientific method is to ensure the reliability of the research result.

7. I believe the answer is: Independent Variable
Independent variable represents the input and the dependent variable represent the output of the experiment.
In an experiment, Independent Variable would be used as something that could influence the dependent variable in order to find out whether there is a causal and effect relationship between the variables.

8. I believe the answer is: Scientific Notation
Scientific Notation is a method that often used in scientific field in order to represent the number that either too big or too small to be written.
For example, rather than writing 2,000,000,000,000,  scientists could use scientific notation and shorten it to 2 x 10^12

9. The answer is Le Systeme International d'Unites (SI)
Le Systeme International d'Unites (SI) is a standard measurement system that acceptable by scientists from all nations in the world.
Using this measurement will allow foreign scientist to review our experiment result and accelerate the pursue of truth

It's either -limiting factors or -scarce resources but i'd go with my first answer since the food and water are abundant they really aren't scarce

Ibelieve the answer is d: quarterany