The main reason it's important to only test one variable at a time is so that?

a. qualitative data can be recorded

b. scientists can easily tell which variable caused the results

c. scientists can have many hypotheses tested at once

d. quantitative data can be recorded

15 ! come and answer! a(n) disease is caused by a pathogen and can spread among organisms. a infectious b noninfectious c toxic d contaminated

What evidence supports the law of conservation of energy? a) mechanical energy is converted to chemical energy during photosynthesis. b) oxygen is made from the breakdown of carbon dioxide during photosynthesis. c)energy is absorbed by chlorophyll and becomes chemical energy during photosynthesis. d)the sun gives off light energy that is absorbed by plants.

What advantages does a pedigree have over a written passage?