Which of the following statements about systems theory are true? Select all that apply. A. Systems theory studies how stress impacts workers .
B. When systems work together, they do more than individual components.
C. System theory looks at how systems work with other systems.
D. If one component of a system is missing, the whole usually improves its performance.

B. When Systems work together, they do more than indivdual components.

C. System theory looks at how systems work with other systems.

Both above would be the correct answers^^^

Explanation:

Hope this helps!

when in a crucial situation, after calling 911, the correct posture for delivering effective compression is the proper hand placement.

first, place two fingers at the sternum, then put the heel of your other hand next to the fingers and place hand on top of the other. lock your elbows by using your body’s weight and compress the victim’s chest with a depth of 2 inches.

moreover, do 15 compression and 2 breaths, this process must be done four times until there is a pulse or a arrive.