I believe the answer is tertiary
You can draw a free body diagram with two 250N forces acting on the human, one from each side. The net force is 0 because the two applied forces cancel each other out since they are in opposite directions.
Structures in plant leaves that open and close to maintain homeostasis are called stomata. This is where gases would diffuse in and out of the leaf.
I believe that the answer is B.
Answer:
I answered this....check for the other question u posted it has the answer:)
