An example of a communicable disease is:
a. cancer.
b. chronic respiratory disease
c. diabetes
d. giardiasis

In which situations is the principle of cross-cutting relationship useful in determining relative age?

How do living things obtain phosphorus

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?