Name two (2) involuntary muscular activities that occur in the body while a person is sleeping. ​

Name the type of chemical that speeds up digestion

Astudent observes a star from two positions of earth in its orbit, in summer and winter, and measures the change in the position of the star. which of these can be best calculated by this method?

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?