The items listed below were found in a science classroom.

- a heart made of plastic with many of its parts labeled.
- clay formed to look like earth and other planets.
- a giant plastic plant cell with removable cell parts.

these items are all examples of..

a) models
b) control
c) experiments
d) variables

Acharge q experiences no net force at a particular point in space. which of the following situations described below must always be true? -there are no other charges nearby. -if there are other charges nearby, they must all have the same sign as q. -if there are other charges nearby, they must all have the opposite sign of q. -if there are other charges nearby, the total positive charge must equal the total negative charge. -none of the above