15. electricity and magnetism
o how are electricity and magnetism related?
o how do you make an electromagnet? what can you do to increase its power?
o what is the difference between a bar magnet and an electromagnet?
o what are the differences between a series and a parallel circuit? draw an example of each.

Which process must a cell undergo top identical cells at the end of cell division

The diagram shows a fossil of an ancient whale skull and a skull of a present-day whale. the ancient whale is extinct and is believed to be an ancestor of the present-day whale. what do these skulls most likely show that supports darwin’s theory of evolution? all populations can adapt and survive. only some organisms have a common ancestor. populations change slowly over time. populations rapidly become extinct.

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?