How are bacteria and humans different? a. bacteria are single-celled. b. bacteria do not reproduce. c. humans take in energy. d. humans have the ability to move around.

A) Humans are made up of many cells while Bacteria are single-celled orginisms. We can reproduce, take energy and have the ability to move around

Nonmetals usually react by gaining electrons

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.