I believe the answer is that they release hormones into the bloodstream for distribution around the body. The endocrine glands produce and secrete hormones, which are chemical substances produced in the body that regulate the activity of cells or organs. These hormones regulate the body's metabolism, growth and sexual development and function.
Mitochondria is the right one hope this helped you!
"By working together voluntarily" is the statement among the choices given in the question that <span>best explains how railroad companies were able to standardize their timetables in 1883. The correct option among all the options that are given in the question is the second option or option "B". I hope it helps you.</span>