Why do classification systems change over time? O Scientists find new evidence in their studies.
O Scientists use old methods of classification.
O Scientists repeat experiments and find no changes.
O Scientists find similar evidence to previous work.

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.

currents is the correct answer.