Asource of sound is detected in the middle of a room. which can account for a decrease in sound intensity for an observer? a. a decrease in speed from the source b. an increase in speed from the source c. a decrease in the radius from the source d. an increase in the radius from the source

How is the composition of a meteorite relevant to finding out the composition of earth's core?

What method(s) do plants use to obtain nitrogen? select all that apply. absorb it from the atmosphere use bacteria to convert nitrogen to usable form obtain usable nitrogen compounds from the soil absorb nitrogen from water taken in at the roots

Which statement is true about hcl? (5 points) select one: a. it is a salt because it increases the concentration of metallic ions. b. it is a salt because it is formed by the reaction of an acid and a base. c. it is an acid because it increases the concentration of hydroxyl ions. d. it is an acid because it increases the concentration of hydronium ions.