Which of these conclusions is most likely correct about the location from where the fossil was discovered? It was a sea which was replaced by a forest.
It was a forest which was replaced by a sea.
It is mainly covered with salt water bodies.
It is mainly covered with fresh water bodies.

You have a resistor and a capacitor of unknown values. first, you charge the capacitor and discharge it through the resistor. by monitoring the capacitor voltage on an oscilloscope, you see that the voltage decays to half its initial value in 2.70 miss . you then use the resistor and capacitor to make a low-pass filter. what is the crossover frequency fc?