Match these items. 1. negative charge
orbit
2. basic unit of matter
John Dalton
3. electron path atom
4. drew first picture of atom
electron
5. three-dimensional orbits
nucleus
6. developed atomic theory
Niels Bohr
7. positive charge
proton
8. the center of an atom
electron cloud

Chicken pox and hepatitis are bacterial diseases. true or false?

Use the drop-down menu to match the following definitions to the corresponding terms. the total variety of organisms that live in the biosphere a group of organisms that breed and produce offspring that can breed all of the biotic and abiotic factors in an area

Which sentence is an example of a strong conclusion to an autobiography? a. i stayed after school three days in a row to practice onstage in the auditorium. b. i knew i would have to practice all week to memorize my dance for the recital. c. after the recital was over, i knew practicing was worth it, and i was looking forward to my next big challenge. d. on opening night, i danced in front of a packed auditorium.