An advertisement touts the muscle-building benefits of a new herbal supplement. before she purchases the supplement, jana investigates the credentials of the individuals testifying to its benefits and does research on the company that manufactures the supplement. she also searches the scientific literature for any controlled research that might attest to the action of the supplement. jana is engaging in thinking.

Jana is engaging in "critical" thinking.

Critical thinking means making reasoned judgments that are legitimate and well-thoroughly considered. It is a state of mind in which you don't just acknowledge all contentions and ends you are presented to but instead have a disposition including addressing such contentions and ends. It requires needing to perceive what confirm is included to help a specific contention or end.

answer; complain or request hazard correction from your employer;

750 h and costs $0.60 per bulb.