What is a group of specialized cells called when they work together to perform a specific function? ( Atom b Organ Organ system​

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?

This part insulates the reaction chamber from the transfer of heat to or from the surrounding environment

Moving down the ramp from 6 meters to