Given a scientific question, generate a correct answer to it.

What term is used to describe the total spread of values in a sample?
range

What two types of communication do both humans and birds use primarily?
visual and auditory

Co 2 , h 2 o, methane, o 3 , nitrous oxides (no and no 2 ), and chlorofluorocarbons (cfcs) are known as what type of gases?
greenhouse gases