Each piston is joined to the connecting rod by a which fits through a machined hole in the piston.
a. piston skirt
b. wrist pin
c. ring pin
d. cam pin

When can a theory be modified if a new type of technology allows for new observations that raise new questions? a-immediately, while the questions about the theory are being asked b-after new hypotheses related to the theory are tested in experiments c-only after the new observations disprove all parts of the theory d-while scientists begin to think about how the theory could improve