Which idea no longer works in the quantum mechanical model of the atom? - Most of the atom is empty space
- Electrons orbit the nucleus like planets orbit the sun.
- Electrons can jump up and down energy levels.
- Atoms have a central nucleus with a positive charge.

One or more substances changing into one or more substances is an example of a

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.