Which waves can travel through a vacuum?
light waves
ocean waves
sound waves
mechanical waves

Study the diagram of a desert food chain . what would most likely happen if the kangaroo rats were killed off and removed from the food chain ?

Which experiment would most likely contain experimental bias

The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?