Which of the following are not biotic factors in a terrestrial ecosystem?
a. herbivore population
b. plants
c. rivers
d. soil bacteria

Which properties describe all matter?

And give a detailed description! scientist observes the boundary between two tectonic plates for a decade and finds that no new volcanoes have formed over the course of her investigation. does this result support the theory of plate tectonics? why or why not?

Awave has a wavelength of 15 mm and a frequency of 6 hertz. what is its speed?