15 points! What are the independent, dependent and controlled variables in the following investigation?

-Mayra tested three brands of conditioner to see which made her hair feel softest.

According the inverse square law, doubling the distance from the source of the sound, a speaker, for example, will drop the sound 6 db each time. if you were standing in the back of an auditorium, 32 feet away from a speaker not using any amplification, would you be able to hear a speaker clearly? why or why not?

Fungi are classified into how many groups? a. 1 group b. 2 groups c. 3 groups d. 4 groups

Select the correct answer. what does the hardy-weinberg principle relate to? a. chances of survival of an organism b. frequency of alleles in a population c. natural selection in a species d. causes of evolution among organisms